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Prove that one interior angle of a a regular octagon = 135 degrees

Regular octagon has 6 triangles within it.

Total of interior angles in a triangle = 180 degrees

So the total of interior angles within a regular octagon would = 180 x 6 (=1080).

All angles in a regular octagon are equal 1080/8 = 135

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Prove that one interior angle of a a regular octagon = 135 degrees

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