ABC is an equilateral triangle.
D lies on BC.
AD is perpendicular to BC.
Prove that triangle ADC is congruent to triangle ADB.
Hence, prove that .
Did this page help you?
ABC is an equilateral triangle.
D lies on BC.
AD is perpendicular to BC.
Prove that triangle ADC is congruent to triangle ADB.
Hence, prove that .
Did this page help you?
is a quadrilateral.
.
Angle = angle .
Prove that .
Did this page help you?
Quadrilaterals ABCD and LMNP are mathematically similar.
Angle A = angle L
Angle B = angle M
Angle C = angle N
Angle D = angle P
Work out the length of LP.
Work out the length of BC.
Did this page help you?
and are two right-angled triangles.
Work out the length of .
Did this page help you?
Circle the reason why these triangles are congruent.
Did this page help you?
Circle the reason why these triangles are congruent.
Did this page help you?
These two triangles are similar.
Work out the value of .
............................cm
Did this page help you?
Here are two right-angled triangles.
Circle the value of .
Did this page help you?
Which of these is not used to prove that triangles are congruent?
Circle your answer.
Did this page help you?
Triangle is similar to triangle
Calculate the length of .
Write down an expression for in terms of
y = ......................................
Did this page help you?
and are similar triangles.
Work out the length of .
Given that ,
work out the length of .
Did this page help you?
The diagram shows two cylinders, and
Cylinder has height 1.6 m and radius 0.56 m.
Cylinder is mathematically similar to cylinder .
The height of cylinder is 0.6 m.
Work out the radius of cylinder .
....................................................... m
Did this page help you?
and are similar triangles.
Work out the length of .
.......................
Work out the length of .
....................
Did this page help you?
and are similar triangles.
Work out the length of
........................
Did this page help you?
Are these two triangles definitely congruent?
Give a reason.
..................... because ..............................................................................................................
Did this page help you?
ABCD is a parallelogram.
ABP and QDC are straight lines.
Angle ADP = angle CBQ = 90o.
Prove that triangle ADP is congruent to triangle CBQ.
Explain why AQ is parallel to PC.
Did this page help you?
is a rhombus.
and are points on such that
Prove that triangle is congruent to triangle .
Did this page help you?
.
is the midpoint of .
is the midpoint of .
Prove triangle is congruent to triangle .
Did this page help you?
and are straight lines.
and are parallel.
Calculate the length of .
Did this page help you?
ABC and EDC are straight lines.
EA is parallel to DB.
EC = 8.1 cm.
DC = 5.4 cm.
DB = 2.6 cm,
Work out the length of AE.
AC = 6.15 cm.
Work out the length of AB.
Did this page help you?
is a parallelogram.
is the point where the diagonals and meet.
Prove that triangle is congruent to triangle .
Did this page help you?
Circle the reason why these triangles are congruent.
Did this page help you?
Here are four triangles.
Which two triangles are congruent?
Circle two letters below.
Did this page help you?
and are similar triangles.
Which of these is equivalent to ?
Circle your answer.
Did this page help you?
and are points on a circle.
Angle
Prove that
Did this page help you?
The diagram shows two water towers in Kuwait.
The real height of tower is .
The real height of tower is .
Ahmed makes a scale model of both towers.
The height of tower on the scale model is .
Work out the height of tower on the scale model.
Give your answer correct to the nearest centimetre.
Did this page help you?
The diagram shows triangle ABC.
CD is parallel to AB.
A, C and E lie in a straight line.
Angles of size and are shown.
Insert ° or to make this statement true.
Give a reason for your answer.
Angle DCE = ......... because ....................................................................................................
Use the diagram and the answer to part (a) to show that the angles of a triangle add up to 180°.
Give a reason for each statement you make.
Did this page help you?
In the diagram AB is parallel to CD.
AED and BEC are straight lines.
Prove that triangle ABE is similar to triangle CDE.
Did this page help you?
The diagram below shows two triangles.
Prove that triangle ABC is congruent to triangle ACD.
Did this page help you?
Anna estimates the height of a tree.
Anna holds a ruler vertically so the height of the tree is exactly covered by the ruler.
She is 20 metres from the tree.
The ruler is 30cm long.
The horizontal distance from her eyes to the ruler is 60 cm.
Calculate an estimate of the height of the tree.
.......................... m
Give two reasons why this method may not be suitable to estimate the height of a very tall building.
Did this page help you?
ABCD is a parallelogram.
Prove that triangle ABD is congruent to triangle CDB.
Did this page help you?
and are diameters of a circle, centre .
Prove that triangle and triangle are congruent.
Did this page help you?
and are four points on the circumference of a circle.
and are straight lines.
Prove that triangle and triangle are similar.
You must give reasons for each stage of your working.
Did this page help you?
Steve has a photo and a rectangular piece of card.
The photo is 16 cm by 10 cm.
The card is 30 cm by 15 cm.
Steve cuts the card along the dotted line shown in the diagram below.
Steve throws away the piece of card that is 15 cm by cm.
The piece of card he has left is mathematically similar to the photo.
Work out the value of .
Did this page help you?
Rectangle is mathematically similar to rectangle .
Work out the area of rectangle .
Did this page help you?
PQR and PTS are straight lines.
Angle PTQ = Angle PSR = 90o.
QT = 4 cm
RS = 12 cm
TS = 10 cm
Work out the area of the trapezium QRST.
Work out the length of PT.
Did this page help you?
The diagram shows a triangle .
is a parallelogram where
is the midpoint of ,
is the midpoint of ,
and is the midpoint of .
Prove that triangle and triangle are congruent.
You must give reasons for each stage of your proof.
Did this page help you?
The diagram shows a triangle and a trapezium.
Prove that .
Did this page help you?
In the diagram, AB and DC are parallel lines of equal length.
Prove that angle DAB = angle BCD.
Did this page help you?
ABCD is a quadrilateral.
AD = AB and CD = CB.
Prove that angle ADC is equal to angle ABC.
Did this page help you?
and are points on the circumference of a circle, centre .
is a diameter of the circle.
Prove that angle is 90°
You must not use any circle theorems in your proof.
Did this page help you?
and are points on the circumference of a circle centre .
Prove that angle is twice the size of angle .
Did this page help you?
is a regular pentagon.
and are points on a circle, centre .
and are tangents to the circle.
is a straight line.
Prove that .
Did this page help you?
The two triangles in the diagram are similar.
There are two possible values of .
Work out each of these values.
State any assumptions you make in your working.
Did this page help you?
The diagram shows the side view of a step ladder with a horizontal strut of length 48 cm.
The strut is one third of the way up the ladder.
The symmetrical cross section of the ladder shows two similar triangles.
Work out the vertical height, cm, of the ladder.
...........................cm
Did this page help you?
A and B are points on the circumference of a circle, centre O.
CA and CB are tangents to the circle.
Prove that triangle OAC is congruent to triangle OBC.
Did this page help you?
lies on a circle with diameter .
lies on and lies on such that is parallel to .
= 21 cm, = 18 cm and = 13.5 cm.
Work out the radius of the circle.
............................................ cm
Did this page help you?
The diagonals of the cyclic quadrilateral ABCD intersect at X.
Explain why triangle ADX is similar to triangle BCX.
Give a reason for each statement you make.
AD = 10 cm, BC = 8 cm, BX = 5 cm, CX = 7 cm.
Calculate DX.
DX = ........................................... cm
Did this page help you?
A, B, C and D are points on the circle, centre O.
M is the midpoint of AB and N is the midpoint of CD.
OM = ON
Explain, giving reasons, why triangle OAB is congruent to triangle OCD.
Did this page help you?
A solid metal cone has radius 10 cm and height 36 cm.
Calculate the volume of this cone.
[The volume, , of a cone with radius and height is .]
......................................... cm3
The cone is cut, parallel to its base, to give a smaller cone.
The volume of the smaller cone is half the volume of the original cone.
The smaller cone is melted down to make two different spheres.
The ratio of the radii of these two spheres is 1 : 2.
Calculate the radius of the smaller sphere.
[The volume, , of a sphere with radius is .]
.......................................... cm
Did this page help you?