Sum Interior Degrees in a Polygon

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 the SUM of the angle measures in a nonagon (9 sides)?

• 1440°

• 900°

• 1080°

• 1260°

What is the sum of interior angles for a 27-gon?

• 4860

• 4500

• 3700

• 2700

What is the SUM of the angle measures in a DECAGON (10 sides)?

• 1440°

• 900°

• 1080°

• 1260°

Find the value of X.

• 100° 

• 110° 

• 150° 

• 168° 

Find the value of X.

• 90° 

• 98° 

• 100° 

• 115° 

What is the sum of interior angles for a pentagon?

• 900

• 540

• 360

• 108

What is the sum of interior angles for a 16-gon?

• 2880

• 2520

• 1600

• 157.5

Solve for x

• 94

• 25

• 36

• 180

What is the sum of interior angles for an octagon?

• 1440

• 1080

• 1800

• 135