Vector Planes (DP IB Maths: AA HL)

Exam Questions

4 hours30 questions
1a
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2 marks

A plane capital pi contains the point straight A left parenthesis 3 comma space 9 comma negative 1 right parenthesis and has a normal vector open parentheses table row 4 row cell negative 2 end cell row 2 end table close parentheses. 

Find the equation of the plane in its Cartesian form.

1b
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2 marks

A second point straight B has coordinates left parenthesis negative 4 comma space 1 comma negative 3 right parenthesis

Determine whether point B lies on the same plane.

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2a
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3 marks

A plane capital pi has equation bold italic r equals open parentheses table row 3 row 3 row 2 end table close parentheses plus lambda space open parentheses table row cell negative 2 end cell row 5 row 3 end table close parentheses plus mu space open parentheses table row 5 row 2 row 7 end table close parentheses.

A line with equation bold italic r equals open parentheses table row 6 row cell negative 2 end cell row 1 end table close parentheses plus beta space open parentheses table row 4 row 0 row 3 end table close parentheses intersects capital pi at a point straight Q

Write down the equations of the line and the plane in their parametric forms.

2b
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5 marks

Given that the coordinates of straight Q are open parentheses table row cell 10 comma end cell cell negative 2 comma space 4 end cell end table close parentheses, find the values for beta comma space lambda and mu at the point of intersection.

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3a
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2 marks

Consider the two planes capital pi subscript 1 and capital pi subscript 2 which can be defined by the equations 

capital pi subscript 1 colon space x plus 2 y minus z equals 5 

capital pi subscript 2 colon space minus 3 x minus y plus 8 z equals 1 

Write down expressions for the normal vectors of each of the two planes.

3b
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5 marks

Hence find the angle between the two planes. Give your answer in radians.

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4a
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2 marks

The points straight A comma space straight B and straight C have position vectors a comma space b and c respectively, relative to the origin straight O.

The position vectors are given by 

bold italic a equals 2 bold italic i plus 3 bold italic j minus bold italic k 

bold italic b equals negative bold italic i plus 2 bold italic j plus 2 bold italic k 

bold italic c equals bold italic i minus 4 bold italic j plus 3 bold italic k 

Find the direction vectors AB with rightwards arrow on top and AC with rightwards arrow on top.

4b
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2 marks

Points straight Astraight B and straight C all lie on a single plane. 

Use the results from part (a) to write down the vector equation of the plane.

4c
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4 marks

Find the Cartesian equation of the plane.

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5a
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2 marks

A plane lies parallel to the line with equation bold italic r equals open parentheses table row 2 row cell negative 2 end cell row cell negative 1 end cell end table close parentheses plus beta space open parentheses table row 3 row 9 row 1 end table close parentheses and contains the points straight P and straight X with coordinates left parenthesis 5 comma space 4 comma space 5 right parenthesis  and left parenthesis negative 2 comma space 2 comma space 0 right parenthesis respectively. 

Find the vector PX with rightwards arrow on top.

5b
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2 marks

By appropriate use of the vector product, find the normal to the plane.

5c
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2 marks

Hence find the Cartesian equation of the plane.

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6a
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3 marks

Consider the plane defined by the Cartesian equation 5 x minus 3 y minus z equals 13. 

Show that the line with equation bold italic r space equals space open parentheses table row 3 row 0 row 2 end table close parentheses plus lambda space open parentheses table row 1 row 4 row cell negative 7 end cell end table close parentheses  lies in the plane.

6b
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3 marks

Show that the line with Cartesian equation x minus 2 equals fraction numerator y minus 6 over denominator 2 end fraction equals 2 minus z is parallel to the plane but does not lie in the plane.

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7a
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3 marks

Consider the planes capital pi subscript 1 comma space capital pi subscript 2 and capital pi subscript 3, which are defined by the equations 

capital pi subscript 1 colon space 3 x minus 5 y plus z equals 27 

capital pi subscript 2 colon negative 4 x plus y plus 2 z equals negative 10 

capital pi subscript 3 colon negative 2 x minus y minus z equals negative 1 

By solving the system of equations represented by the three planes show that the system of equations has a unique solution.

7b
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1 mark

Hence write down the coordinates of any point(s) where all three planes intersect.

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8a
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4 marks

Consider the line straight L with vector equation bold italic r bold space equals left parenthesis 1 minus lambda right parenthesis bold italic i plus left parenthesis lambda minus 2 right parenthesis bold italic j plus left parenthesis 3 plus 2 lambda right parenthesis bold italic k and the plane capital pi with Cartesian equation 3 x minus 2 y plus z equals 11

Find the angle in radians between the line straight L and the normal to the plane capital pi.

8b
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2 marks

Hence find the angle in radians between the line straight L and the plane capital pi.

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9a
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2 marks

Two planes capital pi subscript 1 and capital pi subscript 2 are defined by the equations 

capital pi subscript 1 colon 3 x minus 2 y plus 4 z equals 18 

capital pi subscript 2 colon negative 2 x plus y plus 2 z equals 7 

Write down expressions for the normal vectors of each of the two planes.

9b
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2 marks

Find the cross product of the two normal vectors.

9c
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3 marks

Find the coordinates of a point that lies on both planes.

9d
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2 marks

Hence find a vector equation of the line of intersection of the two planes.

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10a
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4 marks

A line straight L subscript 1 is defined by the Cartesian equation fraction numerator x over denominator 3 d plus 1 end fraction equals fraction numerator y minus 3 over denominator 4 end fraction equals 5 minus z and a plane capital pi is defined by the Cartesian equation negative x plus d y minus 4 z equals negative 29,  where d is a real constant. 

The line straight L subscript 1 lies in the plane capital pi.

Use the fact that the line straight L subscript 1 lies in the plane capital pi to find the value of the constant d.

10b
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2 marks

Another line, straight L subscript 2, passes through the origin and is perpendicular to the plane capital pi.

Write down the equation of line straight L subscript 2 in vector form.

10c
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3 marks

By considering the parametric form of the equation for straight L subscript 2, or otherwise, determine the point of intersection between line straight L subscript 2 and the plane capital pi.

10d
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2 marks

Hence determine the minimum distance between the plane capital pi and the origin.

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1a
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7 marks

The points A(2, 1, 0), B(-1, 4, 1) and C(1, 0, 3) lie on a plane capital pi.

Find an equation for capital pi in the form a x plus b y plus c z equals d where a comma space b comma space c comma space d element of straight integer numbers.

1b
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2 marks

Determine whether the point D(-2, 2, 5) lies on capital pi.

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2a
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3 marks

The plane capital pi has equation r times open parentheses table row 4 row cell negative 3 end cell row 1 end table close parentheses equals 8.

The line L has equation r equals open parentheses table row 2 row cell negative 1 end cell row 5 end table close parentheses plus s open parentheses table row 1 row 2 row 4 end table close parentheses

The plane capital pi and the line L intersect at the point X.

Find the coordinates of X.

2b
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4 marks

Find the acute angle, in degrees, between the line L and the plane capital pi.

2c
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2 marks

The point P(1,-3, 1) lies on the line L.

Find the exact value of PX.

2d
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2 marks

Hence find the shortest distance between the point P and the plane capital pi.

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3
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5 marks

Find the acute angle, in radians, between the two planes capital pi subscript 1 and capital pi subscript 2 which can be defined by the equations:

capital pi subscript 1 space colon space 5 x minus 2 y plus z equals 19

capital pi subscript 2 space colon straight r times open parentheses table row 3 row 5 row cell negative 2 end cell end table close parentheses equals 20.

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4a
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3 marks

The line L given by the Cartesian equation fraction numerator x minus 1 over denominator 2 end fraction equals fraction numerator 3 minus y over denominator 3 end fraction equals z plus 2 lies on the plane capital pi.The point P(4, 0, -3)  also lies on capital pi. space

Show that the vectors open parentheses table row 2 row cell negative 3 end cell row 1 end table close parentheses and open parentheses table row 1 row 0 row cell negative 2 end cell end table close parentheses are parallel to capital pi. space

4b
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4 marks

Hence find the Cartesian equation of capital pi .

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5a
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3 marks

Consider the plane capital pi defined by the Cartesian equation 2 x minus 5 y plus 3 z equals 19 and the line L subscript 1 defined by the vector equation straight r equals open parentheses table row 7 row cell negative 4 end cell row 9 end table close parentheses plus lambda open parentheses table row 4 row 1 row cell negative 1 end cell end table close parentheses.

Show that the line L subscript 1 is parallel to the plane capital pi but does not lie in the plane.

5b
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2 marks

The line L subscript 2  is perpendicular to the plane capital pi and passes through the point P(7, -4, 9) .

Find a vector equation of the line L subscript 2.

5c
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3 marks

Find the coordinates of the point where the line  L subscript 2and the planespace capital pi spaceintersect.

5d
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2 marks

Hence find the shortest distance between the line L subscript 1 and the plane capital pi.

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6a
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3 marks

Consider the two planes defined by the Cartesian equations:

capital pi subscript 1 ∶ 2 x plus y plus 2 z equals 8

capital pi subscript 2 ∶ 3 x minus y minus 2 z equals 7. 

The line L is the intersection of the planes capital pi subscript 1 and capital pi subscript 2.

Show that the line L is parallel to the vector open parentheses table row 0 row 2 row cell negative 1 end cell end table close parentheses.

6b
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3 marks

The point Popen parentheses a comma space 0 comma space b close parentheses lies on both planes.

(i)
Find the values of a and b.
(ii)
Hence write down a vector equation of the line L.
6c
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4 marks

A third plane capital pi subscript 3 has the Cartesian equation 2 x minus 3 y plus z equals 14.

Use algebra to show that the three planes intersect at a unique point Q and find the coordinates of Q.

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7a
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6 marks

Consider the three planes with Cartesian equations:

capital pi subscript 1 ∶ 2 x plus 3 y plus k z equals 11

capital pi subscript 2 ∶ 3 x plus y minus z equals negative 8

capital pi subscript 3 ∶ x minus 5 y plus 2 z equals 15

where k is a real constant. 

In the case when the three planes do not intersect at a unique point, find the value of k  and state the geometrical relationship between the three planes.

7b
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2 marks

In the case when k equals 0 find the coordinates of the point of intersection between the three planes.

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8a
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3 marks

Two parallel planes are defined by the equations:

 capital pi subscript 1 ∶ straight r times open parentheses table row 7 row cell negative 4 end cell row a end table close parentheses equals 113 comma space a element of straight real numbers comma

capital pi subscript 2 ∶ straight r equals open parentheses table row 11 row cell negative 3 end cell row 5 end table close parentheses plus lambda open parentheses table row b row 4 row cell negative 1 end cell end table close parentheses plus mu open parentheses table row 7 row cell negative 2 end cell row cell negative 3 end cell end table close parentheses comma space b element of straight real numbers.

Show that a equals 19 and find the value of b.

8b
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2 marks

Write down a vector equation of the line L that is perpendicular to both planes and goes through the point P(11, -3, 5).

8c
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3 marks

Find the coordinates of the point where the line L intersects the plane capital pi subscript 1.

8d
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2 marks

Hence find the shortest distance between the two planes and capital pi subscript 2.

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9a
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2 marks

The plane capital pi has the vector equation straight r equals open parentheses table row 6 row cell negative 19 end cell row cell negative 6 end cell end table close parentheses plus lambda open parentheses table row 7 row cell negative 3 end cell row 1 end table close parentheses plus mu open parentheses table row cell negative 2 end cell row 8 row cell negative 1 end cell end table close parentheses.

Find a vector that is perpendicular to the plane capital pi .

9b
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4 marks

Q is the point on the plane capital pi  that is closest to the point P(4, 0, -3). Find the coordinates of the point Q.

9c
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3 marks

Hence find the reflection of the point P in the plane capital pi.

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10a
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3 marks

Two planes are defined by the Cartesian equations:

capital pi subscript 1 ∶ x minus 2 y plus 3 z equals 11

capital pi subscript 2 ∶ 3 x plus 4 y minus z equals 3.

Find the acute angle, in radians, between capital pi subscript 1and capital pi subscript 2.

10b
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2 marks

A third plane capital pi subscript 3 is defined by the equation  5 x plus k y plus z equals 13 spacewhere k element of straight real numbers.

The plane capital pi subscript 3 is perpendicular to the plane capital pi subscript 1. Find the value of k.

10c
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4 marks
(i)
Describe the geometrical configuration of the three planes.
(ii)
Find the acute angle, in radians, between capital pi subscript 2 and capital pi subscript 3.

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1
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9 marks

Determine whether the points A(1, -1, 8) , B(0, 10, 15) , C (-2, -6. 10) and D(3, -5, 3) can lie in the same plane.

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2a
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3 marks

The plane capital pi has vector equation straight r equals open parentheses table row cell negative 1 end cell row 5 row 2 end table close parentheses plus lambda open parentheses table row 3 row cell negative 2 end cell row cell negative 2 end cell end table close parentheses plus mu open parentheses table row 4 row 1 row 5 end table close parentheses 

The line L has vector equation straight r equals open parentheses table row 0 row 4 row 5 end table close parentheses plus s open parentheses table row 1 row 1 row cell negative 3 end cell end table close parentheses 

The plane capital pi and the line L intersect at the point straight X

Find the coordinates of straight X.

2b
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5 marks

Find the acute angle, in degrees, between the line L and the plane space capital pi.

2c
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4 marks

The point P(2, 6, -1) lies on the line L.

Find the shortest distance between the point P and the plane capital pi. Fully justify your answer.

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3
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7 marks

Find the acute angle, in radians, between the two planes capital pi subscript 1and capital pi subscript 2 which can be defined by the equations:

capital pi subscript 1 ∶ 7 x plus 3 y minus 2 z equals 84 comma

capital pi subscript 2 ∶ straight r equals open parentheses table row 11 row cell negative 7 end cell row 9 end table close parentheses plus lambda open parentheses table row cell negative 2 end cell row 5 row 0 end table close parentheses plus mu open parentheses table row 1 row 6 row cell negative 4 end cell end table close parentheses.

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4a
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2 marks

The plane capital pi subscript 1is defined by the equation x minus 2 y minus 2 z plus 15 equals 0 spaceand the line L is defined by the vector equation  straight r equals open parentheses table row cell negative 5 end cell row 1 row 4 end table close parentheses plus lambda open parentheses table row 4 row cell negative 3 end cell row 5 end table close parentheses.

Show that the line L lies on the plane capital pi subscript 1.

4b
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3 marks

The plane capital pi subscript 2 is defined by the equation straight r equals open parentheses table row 3 row 1 row 4 end table close parentheses plus s open parentheses table row 12 row cell negative 1 end cell row 7 end table close parentheses plus t open parentheses table row 2 row 5 row cell negative 4 end cell end table close parentheses,

Show that the plane  capital pi subscript 2 is parallel to the plane capital pi subscript 1.

4c
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2 marks

Find a vector equation of the line that is perpendicular to both planes and passes through the point P(3, 1, 4).

4d
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4 marks

Hence find the shortest distance between  capital pi subscript 1 and capital pi subscript 2.

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5a
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3 marks

The plane capital pi has the Cartesian equation x plus 4 y plus 2 z plus 25 equals 0

The line Lhas the Cartesian equation fraction numerator 3 minus x over denominator 2 end fraction equals k open parentheses y plus 2 close parentheses equals z plus 1 fifth comma where k element of straight real numbers.

Show that the L is not parallel to the plane capital pi.

5b
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7 marks

Given that the acute angle between the line L and the plane capital pi is 60°, find the possible values of k.

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6a
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5 marks

Consider the two planes defined by the Cartesian equations:

capital pi subscript 1 ∶ 3 x minus 5 y plus 2 z equals 9

capital pi subscript 2 ∶ 4 x plus 2 y minus z equals 13. 

The line L is the intersection of the planes capital pi subscript 1 and space capital pi subscript 2. 

Find a vector equation of the line L. Give your answer in the form straight r equals open parentheses table row 1 row a row b end table close parentheses plus lambda open parentheses table row c row d row e end table close parentheseswhere a comma space b comma space c comma space d comma space e space element of straight integer numbers.

 

6b
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5 marks

A third plane capital pi subscript 3 has the Cartesian equation x plus 3 y plus k z equals 10 where k element of straight real numbers. The three planes do not meet at a unique point.

Find the exact value of k and determine the geometrical relationship between the three planes.

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7a
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2 marks

Consider the four planes with Cartesian equations:

 capital pi subscript 1 ∶ 6 x minus y plus 3 z equals 16

capital pi subscript 2 ∶ 4 x plus k y plus 2 z equals 4

capital pi subscript 3 ∶ 2 x minus 5 y plus 2 z equals 7

capital pi subscript 4 ∶ x plus 3 y minus z equals m

where k and m are real constants.

In the case where there is no unique point of intersection of the three planes capital pi subscript 1 comma capital pi subscript 2and capital pi subscript 3, find the value of k and give a geometric interpretation of the three planes.

7b
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4 marks

In the case where k equals 6, find the coordinates of the point of intersection between the three planes capital pi subscript 1 comma capital pi subscript 2 and space capital pi subscript 3.

7c
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5 marks

In the case where there is a common line of intersection between the three planes capital pi subscript 2 comma capital pi subscript 3 a n d space capital pi subscript 4, find the values of k and m.

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8a
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7 marks

The point P(2, 0, -1)  is reflected in the plane capital pi which has equation straight r. open parentheses table row 4 row cell negative 3 end cell row 5 end table close parentheses equals 78.

Find the coordinates of the reflection of P in the plane capital pi.

8b
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2 marks

The line L subscript 1 passes through the point P and intersects the plane capital pi at the point Q(8, 3, 11) . The line L subscript 1is reflected in the plane capital pi to form line L subscript 2.

Find a vector equation of the line L subscript 2 .

8c
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4 marks

Find the acute angle, in degrees, between the lines L subscript 1and L subscript 2.

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9a
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3 marks

Two planes are defined by the equations:

 capital pi subscript 1 ∶ x plus 2 y minus z equals 5 comma

capital pi subscript 2 ∶ 2 x plus 5 y plus 2 z equals 7.

Find the exact value of cos space theta where theta is the acute angle between capital pi subscript 1 and capital pi subscript 2.

9b
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4 marks

capital pi subscript 1 and capital pi subscript 2 intersect at the line L subscript 1 comma 2 end subscript. A third plane capital pi subscript 3 is defined by the equation x plus k y plus 11 z equals m where k comma m element of straight real numbers and capital pi subscript 3 is perpendicular to capital pi subscript 1.  When m equals a the line L subscript 1 comma 2 end subscriptlies on all three planes.

Find the values of k and a.

9c
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3 marks

Given that m not equal to a comma space capital pi subscript 1 and capital pi subscript 3 intersect at the line L subscript 1 comma space 3 end subscript comma space capital pi subscript 2 space end subscript a n d space capital pi subscript 3 intersect at the line L subscript 2 comma 3 end subscript. The shortest distance between the lines L subscript 1 comma 2 end subscript space and space L subscript 1 comma 3 end subscript is square root of 11.

Find the shortest distance between the lines L subscript 1 comma 2 space end subscriptand L subscript 2 comma 3 end subscript. Give your answer as an exact value.

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10
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12 marks

The plane capital pi is defined by the Cartesian equation 4 x minus 5 y plus 3 z equals 59

The line L is defined by the Cartesian equation fraction numerator 4 minus x over denominator 2 end fraction equals y plus 1 equals 2 open parentheses z minus 3 close parentheses

Determine whether the point P(5, 8, 15) is closer to the plane capital pi or the line L.

Fully justify your answer.

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