Interior and Exterior Angles in Polygons

What is the sum of the interior angles of a 21-gon?

• 4140

• 3780

• 3240

• 3420

What polygon has a sum of interior angles of 1620?

• Undecagon

• Dodecagon

• Decagon

• Nonagon

What is the value of x?

• 75.5

• 38

• 151

• 21

What is the measure of x?

• 14

• 156

• 95

• 109

What is the measure of the interior angles of a nonagon?

• 1260

• 1080

• 900

• 1440

What is the sum of the interior angles of an octagon?

• 1260

• 1080

• 135

• 900

What is the sum of the measures of the interior angles of a 14-gon?

• 2340

• 1980

• 1470

• 2160

Select the correct values for a and m.

• a=50, m=89

• a=50, m=116

• a=105, m=89

• a=105, m=116