Sum of a Polygon

Find the interior angle sum for each polygon. Round your answer to the nearest tenth if necessary.

• A

• B

• C

• D

A polygon has a sum of interior angle measures equal to 1620°. How many sides does the polygon have?

• 9

• 11

• 13

• 7

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

Tags

CCSS.3.MD.D.8

Find the angle SUM of the interior angles of the polygon.

• 180°

• 540°

• 720°

• 1080°

The sum of the interior angles of a polygon is 3960°. How many sides does the polygon have?

• 12

• 24

• 25

• 13

Solve for X

• 27

• 72

• 80

• 14

Find the measure of the angle x.

• 105

• 115

• 65

• 75

Find the angle sum of the interior angles of the polygon.

• 720° 

• 900° 

• 1080° 

• 1260°