Question

the sizes of seven of the exterior angles of an octagon are 42°, 110°, 130, 67°, 55°, 11° and 53º. Work out the size of each of the eight interior angles.​

Answer 1

Each interior angle of the regular octagon is equal to 135°.

Each exterior angle is the supplementary angle to the interior angles.

sum of all interior angles of a regular polygon is equal to 1080°

each interior angle of a regular octagon is equal to 1080/8 = 135°.

Good luck.