In a quadrilateral, ABCD, DO and CO are the bisectors of∠D and ∠C respectively. Prove that ∠COD = 1/2[∠ A+ ∠ B]
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Answer:
Given,
In quadrilateral ABCD,
A:B:C:D = 1:2:3:4:5
Let angles A, B, C, D = x, 2x, 4x, 5x
So,
x+2x+4x+5x = 360
∘
12x = 360
∘
So,
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