Sum of Angles of Polygon

To find the sum of all the interior angles of any polygon, regular or not, use the formula (n-2)180, where n is the number of sides. Which are the interior angles of this polygon?

• The white colored angles

• The red colored angles

• the black colored angles

• the blue colored angles

Use the formula (n-2)180 to find the sum of the interior angles of this polygon.

• 180 degrees

• 360 degrees

• 540 degrees

• 720 degrees

Find the sum of the interior angles of this polygon.

• 180 degrees

• 360 degrees

• 540 degrees

• 720 degrees

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

• 1440°

• 900°

• 1080°

• 1260°

To find a missing angle of a polygon first find the sum of all the angles then subtract the angles you know. A pentagon has 540 degrees and the sum of the interior angles I know is 428 degrees to get the missing angle subtract.

• 112 degrees

• 180 degrees

• 428 degrees

• 540 degrees

Find the value of x.

• 110

• 90

• 130

• 120

Find the size of angle x

• 135^o

• 150^o

• 144^o

• 140^o

The sum of the exterior angles of any polygon is always 360 degrees no matter how many sides it has. Which one of the following does not have exterior angles that add up to 360 degrees.

• 
• 
• 
• They all have exterior angles that add up to 360 degrees

What is the sum of exterior angles for a 27-gon?

• 4860

• 4500

• 360

• 270

Find the size of angle x

• 108^o

• 120^o

• 90^o

• 144^o