Polygon Sum Theory

Mathematical Equivalence

ON

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

• 1440°

• 900°

• 1080°

• 1260°

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

• 3240 degrees

• 3600 degrees

• 5400 degrees

• 3060 degrees

What is the formula for finding the sum of the interior angles of a polygon? (a)  

• S= (n-2)180

• S= (n-180)2

• S= (n-2)180/n

• S= (n - 180)2/n

What is the sum of the exterior angles of a 20-gon?

• 180

• 360

• 3240

• 162

What is the sum of the measures of the interior angles of the regular hexagon?

Mathematical Equivalence

OFF

The Polygon Angle Sum Theorem says that the sum of the ​ (a)   angles of a polygon is equal to ​​ (b)   degrees.

• interior

• 180(n - 2)

• exterior

• 360(n - 2)

• 180(n - 1)

• 180n

• 360(n - 1)

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

• 540 degrees

• 180 degrees

• 360 degrees

• 108 degrees

What is the sum of the exterior angles of a 13-gon? Enter your answer as a number only

Mathematical Equivalence

ON

What is the value of x?

• 26.25

• 38.75

• 24

• 25.125