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In a quadrilateral ABCD, if ∠A = 80°, ∠B = 100°, ∠C = 50°, then ∠D = _____. 1. 130° 2. 100° 3. 110° 4. 120° |
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Answer» Correct Answer - Option 1 : 130° Given: ∠A = 80°, ∠B = 100°, ∠C = 50° Concept used: The sum of interior angles in a quadrilateral is 360°. Calculation: ∠A + ∠B + ∠C + ∠D = 360° ⇒ 80° + 100° + 50° + ∠D = 360° ⇒ ∠D = 360° - 230° ⇒ ∠D = 130° ∴ The value of ∠D = 130°. |
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