Polygon Angle-Sum Theorem

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

• 1440°
• 900°
• 1080°
• 1260°

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

• 60°
• 90°
• 120°
• 180°

Find the measure of the missing angle

• 50°

• 35°

• 100°

• 55°

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

Find the value of x.

• 110

• 90

• 130

• 120

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

• 720° 
• 900° 
• 1080° 
• 1260° 

What is a regular polygon?

• all side lengths are the same length

• all angles are the same (equal in measure)

• only some side lengths are the same

• all side lengths are different

• only some angles are the same

What is the sum of the interior angles for a      24-gon

• 3960
• 360
• 15
• 4280

Is the figure a polygon? Is it convex or concave?

• Not a polygon, convex
• Polygon, convex
• Not a polygon
• Polygon, concave

Find the value of X.

• 100° 
• 110° 
• 150° 
• 168°