Question 280329
ABCDEFGH is a regular octagon calculate ABC ACD ABD angles
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Each interior angle is 135 degs
ABC = 135 degs
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ACB = (180 - 135)/2 = 22.5 degs, so ACD = 135 - 22.5
ACD = 112.5 degs
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ABD = ACD = 112.5 degs