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parmarshrey21:
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Given
=> Angle A - Angle C - Angle D = 10°
=> Angle A - 60 = 10 °
=> Angle A = 70°
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Angle C - Angle D = 60°
Angle C = 60 + Angle D
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By A.S.P. of Quadrilaterals
Angle A + Angle B + Angle C + Angle D = 360°
70° + 90° + 60° + 2*(Angle D) = 360°
2*(Angle D) = 360° - 220°
Angle D = 140°/2
Angle D = 70°
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Angle C = 70° + 60°
Angle C = 130°
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