Polygons & Angles

Which formula represents how to find the interior angle sum of any polygon?

• (number of sides - 2) x 180

• (number of sides + 2) x 180

• number of sides x 180

• number of sides x 360

What is a regular polygon? Select all that apply.

• all side lengths are the same length

• all angles are the same (equal in measure)

• only some side lengths are the same

• all side lengths are different

• only some angles are the same

Find the sum of the interior angles.

• A

• B

• C

• D

Find the measure of one interior angle in each regular polygon. Round your answer to the

nearest tenth if necessary.

• A

• B

• C

• D

Find the measure of one interior angle in each regular polygon. Round your answer to the

nearest tenth if necessary.

• A

• B

• C

• D

What is the sum of the interior angles of an octogon?

• 900°

• 1080°

• 1260°

• 1440°

What is the sum of the interior angles of a 25-gon?

• 360°

• 4500°

• 335°

• 4140°

What is the sum of the exterior angles of a polygon?

• 180(n-2)
• 180
• (180(n-2))/n
• 360

Find the measure of one exterior angle of a regular 18-gon.

• 160°
• 360°
• 20°
• 2280°

What is the formula to find one exterior angle in a regular polygon?

• 360/n

• (n-2)180

• 180/n

• ((n-2)180)/n