the octagon in the figure is equiangular and ab ≈ ac .
find m< acb
a. 135
b. 45
c. 30
d. 90
show your work.

The sum of the measures of the interior angles of a regular octagon equal 1080. Each angle equals 1080/8 = 135
The interior angle B = 135 so it's supplement (angle ABC) = 45 degrees. Since AB = AC, triangle ABC is isosceles, therefore angle ACB also equals 45 degrees.
Letter B

Answer-

Solution-

The octagon in the figure is equiangular, i.e the octagon is a regular octagon.

So the octagon has 8 equal sides and 8 equal interior angles.

The sum of all of the interior angles is

Measurement of each interior angle is,

∠ABC is the exterior angle of the octagon.

The interior and exterior angles are complimentary, so

As, in ΔABC AB = AC, so

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