3rd Form Christmas Term Assignment #9

How many sides does a heptagon have?

• 5

• 6

• 7

• 8

How many sides has a decagon?

• 10

• 7

• 11

• 9

If the exterior angle of a regular polygon is 60°, how many sides has the polygon?

• 6
• 10
• 8
• 4

If the exterior angle of a regular polygon is 40°, how many sides has the polygon?

• 6

• 7

• 8

• 9

If the interior angle of a regular polygon is 144°, how many sides has the polygon?

• 10

• 9

• 8

• 7

What is the sum of the interior angles in an octagon?

• 540°

• 720°

• 1080°

• 1240°

A heptagon has interior angles of 80°, 120° and 100°. The remaining angles are equal. Estimate the size of each of the unknown interior angles.

• 110°
• 130°
• 150°

• 90°

An octagon has interior angles of 140°, 130° and 110°. The remaining angles are equal. Estimate the size of each of the unknown interior angles.

• 210°

• 140°

• 190°

• 70°

Find x

• 90°

• 120°

• 160°

• 200°

Find y

• 90°

• 240°

• 60°

• 80°