Triangle is isosceles.
Angle = 32° and .
Find angle .
Angle = .................................................Â
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Triangle is isosceles.
Angle = 32° and .
Find angle .
Angle = .................................................Â
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Work out the value of.
Give a geometrical reason for your answer.
= .................... because .......................................................................
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A student measures the angles in a triangle as 55°, 85° and 50°.
Explain why the student is incorrect.
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The diagram shows an isosceles triangle.
Find the value of .
= .................................................Â
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is a straight line.
Find the value of .
...................................................
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Work out the size of one interior angle of a regular 16-sided polygon.
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Work out the size of one interior angle of a regular 9-sided polygon.
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Find the size of one interior angle of a regular octagon.
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The diagram shows two parallel lines and a straight line crossing them.
Write down, using letters from to ,
the angle that is alternate to angle ,
the angle that is corresponding to angle .
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Find the size of one interior angle of a regular 10-sided polygon.
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Work out the size of one interior angle of a regular polygon with 20 sides.
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The diagram shows an isosceles triangle and a straight line.
Work out the value of .
...............................[2]
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Work out the value of
Give reasons for your answer.
............................ because ....................................................................................................
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is an isosceles triangle and is a straight line.
Find the value of .
= ...................................................Â
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is an isosceles triangle.
is a straight line.
Find the value of .
= ..............................................Â
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is a straight line and is an isosceles triangle.
Find the value of.
= .................................................Â
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In the triangle and angle .
is a straight line.
Work out angle .
Angle = ..................................................Â
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A triangle is isosceles.
One of its angles is 96°.
Find the other two angles.
........................ and ........................Â
Find the value of .
= ...................................................Â
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The diagram shows a triangle drawn between a pair of parallel lines.
Find the value of and the value of .
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A regular polygon has an exterior angle of 20°.
Work out the number of sides of this polygon.
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The diagram shows two parallel lines and two straight lines.
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In the diagram, is parallel to .
Find the value of.
Give a geometrical reason for your answer.
= ......................... because ....................................
Work out the value of .
Give a geometrical reason for your answer.
.................because ......................
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Work out the value of
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The diagram shows a triangle between two parallel lines, and .
Find the value of
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Complete the statements.
............................ because ............................ Â
........................... because ............................Â
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The diagram shows a trapezium.
Work out the value of .
= ..................................................
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Kim knows that one angle of an isosceles triangle is 48°.
He says that one of the other angles must be 66°.
Explain why Kim is wrong.
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The diagram shows triangle and a straight line .
is a point on .
Angle = 25°, angle = 32° and .
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The diagram shows a triangle.
Use the diagram to write down an equation and solve it to find the value of .
 = .................................. [4]
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The diagram shows an isosceles triangle, .
is a straight line.
Find the value of .
................................ [2]
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is a rectangle.
is parallel to .
Find the value of and the value of .
= ......................................................
= ................................................. .....
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Two regular octagons and a square meet at point .
Show, by calculation, that the three interior angles at add up to 360°.
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The diagram shows two pairs of parallel lines.
Find the value of , the value of and the value of .
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The diagram shows part of a different regular polygon.
is an exterior angle.
is an interior angle.
The ratio .
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is a pentagon.
Explain why the diagram shows that the sum of the interior angles of a pentagon is 540°.
Do not measure any angles.
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In the diagram and are straight lines.
Lines and are parallel.
Find angle and give a reason for your answer.
Angle = ................................. because ...................................
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The diagram shows two regular pentagons.
Pentagon is an enlargement of pentagon , centre .
Find angle .
Angle = ..............................Â
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In the diagram, is a straight line.
is parallel to , angle = 34° andÂ
[2]
....................  Â
.................... [2]
[2]
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Each interior angle of a regular polygon is 162°.
Calculate the number of sides of the polygon.
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