Question

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

A. 135
B. 154
C. 180
D. 45

Answer 1

EACH interior angle = 180 - (360 / # of sides)
EACH interior angle = 180 - (360/8)
EACH interior angle = 180 -45
EACH interior angle = 135

Answer 2

The answer is (A) 135.

REMINDER: Interior angles are equal.

Each interior angle = 180 - $\frac{360}{No.OfSides}$
Each Interior angle = 180 - $\frac{360}{8}$
Each Interior angle = 180 ° - 45°
                                     = 135°