Applying properties of polygons

Find the value of x. #38

Type your answer as just the number.

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

• 720° 
• 900° 
• 1080° 
• 1260° 

Find the sum of interior angles in a heptagon

• 900
• 720
• 540
• 180

A polygon has 12 sides. What is the sum of its interior angles?

What is the measure of each interior angle in a regular nonagon?

• 129° 
• 135° 
• 144° 
• 140° 

Find the SUM of the interior angles of the polygon.

• A

• B

• C

• D

Find the sum of the angle measures of a 50-gon

• 8820

• 9000

• 8640

• 8460

The polygon angle-sum theorem states that the sum (total) angle measure of an "n" gon can be found by multiplying the number of triangles formed by the diagonals (without intersection) by 180 degrees.

• True

• False

A polygon has 8 sides. What is the sum of its interior angles?

• $1,080\degree$

• $1,620\degree$

Find angle x

• 21^o

• 201^o

• 111^o

• 191^o