Revision #3

The sum of the interior angles of a polygon is __________________ where n is the number of sides.

• (n - 2)180
• (n - 1)180
• 360
• (n - 3)(180)

The sum of the exterior angles of a polygon is __________________ where n is the number of sides.

• 360
• n
• (n - 2)180
• (n - 1)180

Find the measure of angle E.

• 9
• 97°
• 48°
• 79°

Solve for x. 

• 100
• 120
• 125
• 130

The exterior angle is 60 degrees, how much is the interior angle?

• 360⁰ - 60⁰ = 300⁰
• 180⁰ - 60⁰ = 120⁰

Solve for y.

• 51.67
• 171.67
• 360
• 180

Determine the radius of the penny

• 59.66 mm
• 9.5 mm
• 38 mm
• 119.32 mm

What is the formula for area of a circle?

• C=πd
• C=πd²
• A=πr²
• A= C/d

Sally tried to solve for the area of circle. Her work is shown. What mistake did Sally make.

• Sally squared π incorrectly.

• Sally multiplied the π and radius incorrectly.

• Sally used diameter instead of the radius.

• No mistake. Sally solved the problem correctly.

Find the area of the circle.

• 18.84 m²

• 113.04 m²

• 37.68 m²

• 452.16 m²