What are the angles of the lines that make up an 8 sided shape where each side is the same length?

Correct answer is: 135 degrees..

360 / 8 = 45

I agree that 8 x 45 - 360 but when I measure the angle of two sides of an octagon on a picture of an octagon I get 134 degrees?

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I agree that 8 x 45 - 360 but when I measure the angle of two sides of an octagon on a picture of an octagon I get 134 degrees?