Question

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Answer 1

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2x + 3x = 180 => 5x = 180

x= 36

4y + 5y = 180 => 9y = 180

y= 20

Since the ratios of co-efficients of x and the angles are same, then

∠A = 2 x 36 = 72

∠D = 3 x 36 = 108

likewise, ∠B = 4 x 20 = 80

and ∠C = 5 x 20 = 100

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