Angles in Polygon

What is the SUM of the INTERIOR angles of a 12-gon?

• 3600

• 1800

• 2160

• 12

A polygon has a sum of interior angle measures equal to 1620°. How many sides does the polygon have?

• 9

• 11

• 13

• 7

What is the SUM of the EXTERIOR angles of a hexagon?

• 360

• 120

• 60

• 720

What is the measure of one INTERIOR angle of a regular octagon?

• 60

• 45

• 1080

• 135

step 1: set up an equation

step 2: Solve for x

step 3: Plug in x for each expression

step 4: Add the two answers from step 3

• 82

• 41

• 17

• 90

Tags

CCSS.HSG.CO.C.11

step 1: set up an equation

step 2: Solve for x

step 3: Plug in x for each expression

step 4: Add the two answers from step 3

• 82

• 41

• 17

• 90

Tags

CCSS.HSG.CO.C.11

Find the value of y.

• 110

• 90

• 130

• 120

What is the measure of one EXTERIOR angle of a regular octagon?

• 60

• 45

• 1080

• 135

A regular polygon has an EXTERIOR angle with a measure of 60.  How many sides does it have?

• 6

• 120

• 3

• 60

What is the formula for the sum of the interior?

• S=360

• S=(n-2)180

• n=360/ext. angle

• 1 int. angle + 1 ext. angle=180