Polygon Interior Angle-Sum Theorem and Corollary

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

• 1440°
• 900°
• 1080°
• 1260°

Tags

CCSS.4.MD.C.5

CCSS.4.MD.C.7

What is the SUM of the angle measures in a triangle (3 sides)?

• 60°
• 90°
• 120°
• 180°

Tags

CCSS.8.G.A.5

Find the value of X.

• 100
• 120
• 125
• 130

Tags

CCSS.4.MD.C.5

CCSS.4.MD.C.7

CCSS.4.OA.A.3

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

Tags

CCSS.7.G.B.6

What is the sum of the interior angles of the hexagon shown?

• 180° 
• 540° 
• 720° 
• 1080° 

Tags

CCSS.7.G.B.6

In the Polygon Interior Angle Sum Theorem, what does $n$  represent?

• The measure of the largest interior angle

• The number of sides of the polygon

• Nothing

• The number of triangles that compose the polygon

How many sides would an irregular polygon have if the  interior angle sum is $1800\degree$  ?

• 20 sides

• 21 sides

• 12 sides

• 180 sides

Find the value of X

• 94
• 25
• 36
• 180

Tags

CCSS.7.G.B.5

A _________ polygon has no angles pointing inwards.

• convex

• concave

• round

• square

Each triangle has an angle sum of _______ degrees.