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The angles of a quadrilateral are in A.P with d=10 find the angles |
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Answer» 60° , 80° , 100° and 120° Step-by-step explanation: a-3D + a-d + a+d + a+3d = 360 a - 30 + a - 10 + a + 10 + a + 30 = 360 4a = 360 a = 90° ∴ a - 3d = 90 - 30 = 60° a - d = 90 - 10 = 80° a + d = 90 + 10 = 100° a + 3d = 90 + 30 = 120° ∴ Angles are 60° , 80° , 100° and 120° |
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