Question

What is the measure of each exterior angle of a regular decagon?
A. 144°
B. 1440°
C. 36°
D. 360°

Answer 1

Well, the technique is to solve first the interior angle of a regular decagon. To solve it, you must use the formula: Interior Angle= [180(n-2)]/n where n is the number of sides. When you already know the interior angle, subtract 180 to it to know the exterior angle. :)

Answer 2

so its B?

Answer 3

No, when n=10 is used. The formula would be IA=[180degrees(10-2)]/10=144 degrees
180-144= ? degrees. tell your new answer. :)