Missing Angles in a Polygon

Determine the number of triangles formed by drawing the diagonals from one vertex in the octagon.

• 6

• 7

• 8

• 10

What is the value of x?

If the sum of the interior angles of a polygon equals 900°, how many sides does the polygon have? 

• 7
• 9
• 10
• 12

Find the measure of each interior angle of a regular polygon with 16 sides.

• 156.5°

• 157.5°

• 158.5°

• 159.5°

Susan drew a regular dodecagon and measured one of its interior angles. She got 150°. What is the sum of the measure of the interior angles of this regular polygon?

• 2180°

• 1800°

• 1180°

• 1080°

Find the interior angle on a regular polygon with 40 sides...

• 9^o

• 8^o

• 171^o

• 172^o

The measurement of the sum an interior
angle of a regular nonagon is 1080°

• True
• False

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

• 720° 
• 900° 
• 1080° 
• 1260° 

What is the measure of EACH interior angle of a regular octagon?

If the figure in this picture is a regular polygon, find the value of x.