by angle sum property of a quadrilat Question

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By angle sum property of a quadrilateral, sum of all the interior angles=360 ∘ Let x be the fourth angle.∴48 ∘ 85 ∘ 140 ∘ x=360 ∘ ∴x=360 ∘ −273‬ ∘ =87 ∘
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