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Gcse angle question help!

Gcse angle question help!-example-1

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Each angle in a regular octagon = 135 degrees and
Because of the 2 given equal angles BCDA is a trapezium, so
AD is parallel to BC so < BCD + < CDA = 180 degrees

Therefore < CDa = 180-135 = 45 degrees
and < CDJ = 180 - 45 = 135 degrees (adjacent angles).

User MarkDBlackwell
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