Interior Angles of Polygons (Use a Calculator!)

What is the formula for the SUM OF ALL INTERIOR ANGLES in a polygon?

• (n−2)180

• 360
• 360/n

What is the formula for the measure of EACH interior angle in a polygon?

• (n−2)180

• 360
• 360/n

What is the sum of interior angles for a pentagon?

• 900
• 540
• 360
• 108

What is the sum of interior angles for an octagon?

• 1440
• 1080
• 1800
• 135

Find the interior angle on a regular polygon with 5 sides...

• 72^o

• 108^o

• 60^o

• 120^o

Find the measure of angle x

• 108^o

• 120^o

• 90^o

• 144^o

Find the measure of angle x

• 108^o

• 120^o

• 90^o

• 144^o

Find the measure of angle x

• 135^o

• 150^o

• 144^o

• 140^o

I have 8 sides and 8 vertices. Who am I?

(a)  

• Octagon
• Hexagon
• Square
• Triangle

Hint: use the formula

sum of interior angles = (n−2)180

• 720 degrees

• 540 degrees

• 360 degrees

• 1260 degrees