Circles and Polygons

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

• 7
• 9
• 10
• 12

An exterior angle of a regular polygon
measures 36°. How many sides does
the polygon have? 

• 10
• 5
• 14
• 9

Find the sum of the interior of angles in a 12-gon

• 1800
• 1080
• 1620
• 1260

Find the value of x

• 141
• 150
• 135
• 163

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

• 135

• 180

• 145

• 190

The measures of one interior angle of a regular polygon is 140^o. What is the name of the polygon?

• Decagon

• Nonagon

• Heptagon

• Hexagon

What is the formula for the sum of interior angles in a polygon?

• 180(n−2)

• 180(n−2)÷n

• 360

• 360/n

What is the formula for the sum of exterior angles in a polygon?

• 180(n−2)

• 180(n−2)÷n

• 360

• 360/n

What is the formula for one exterior angle in a regular polygon?

• 180(n−2)

• 180(n−2)÷n

• 360

• 360/n

What is the formula for one interior angle in a regular polygon?

• 180(n−2)

• 180(n−2)÷n

• 360

• 360/n