Interior and Exterior Angles in Polygons

What is the size of one interior angle of a regular nonagon (nine-sided polygon)?

• 40

• 180

• 114

• 140

What is the sum of interior angles of a pentagon?

What is the sum of interior angles of a 13-sided polygon

• 1170

• 1980

• 360

• 2340

What is the size of one interior angle of a regular twenty-sided polygon?

How many degrees is each interior angle of a regular hexagon?

• 120

• 60

• 180

• 36

How many degrees is each interior angle of a regular octagon?

If a regular polygon has an exterior angle equal to 20 degrees, how many sides does the polygon have?

• 20

• 18

• 15

• 12

Solve for x

Each of the interior angles of a regular polygon is 150°. How many sides does the polygon have? (Select the correct setup)

What is the sum of the interior angles of a regular dodecagon (12-sided polygon)?