Question

AB, BC and CD are three sides of a regular octagon.

Find the size of angle BAC.
Give reasons for your answer.​

Answer 1

22.5°

Explanation:

The exterior angle at B is 360°/8 = 45°. The congruent interior angles of the triangle at A and C total this amount. The angle BAC is 45°/2 = 22.5°.