Interior Polygon Sum Theorem

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)

Find the sum of the interior angles of a nonagon.

• 1260

• 900

• 1620

• 180

Solve for x. 

• 100

• 120

• 125

• 130

Find the value of X.

• 60

• 120

• 85

• 55

Find the sum of the interior angle measures of a convex 20-gon.

• 3240 degrees

• 3600 degrees

• 5400 degrees

• 3060 degrees

A polygon's interior angles add up to 2700.  How many sides does the polygon have?

• 17

• 15

• 19

• 11

Find the value of x.

• 540⁰

• 121⁰

• 134⁰

• 360⁰

• The measure of the largest interior angle

• The number of sides of the polygon

• Nothing

• The number of triangles that compose the polygon

What is the SUM of the angle measures in a 35-gon?

• 180°

• 5940°

• 1080°

• 169.71°

Find the sum of the angles measures of a 21-gon.

• 3240

• 3600

• 3780

• 3420