ABCD is a parallelogram. The ratio of angle A and angle B is 7:2. Find the measure of angle A
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∆A : ∆B = 7:2
let ∆A = 7x
let ∆B = 2x
∆A + ∆B = 180° { adjacent ∆5}
7x + 2x = 180°
9x = 180°
x = 180°/9
x = 20°
∆a 7x = 140° , ∆b 2x = 40°
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