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Sample Paper 2021 Basic (goprep)
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Q3 of 180 Page 5

In a cyclic quadr

We know that, In a cyclic quadratic opposite angles are supplementary.


∠A + ∠C = 180°


⇒ 2x + 4 + 2y + 10 = 180


⇒ 2(x + y) = 166


⇒ x + y = 83


⇒ y = 83 – x [1]


Also, ∠B + ∠D = 180°


⇒ y + 3 + 4x – 5 = 180


⇒ 4x + y = 182


⇒ 4x + 83 – x = 182 [From 1]


⇒ 3x = 99


⇒ x = 33°


⇒ ∠A = 2(33) + 4 = 70°


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Questions · 180
Sample Paper 2021 Basic (goprep)
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