Find the value of x that makes abcda parallelogram

pleas

One property of parallelograms is that the sum of the measures of each pair of adjacent angles equals 180°. Angles A and D are adjacent and so are angles B and C. So, the sum of the measures of the angle pairs must equal 180°. I will use the angle pair A and D for this problem.

m∠A = 70°

m∠D = x + 40°

m∠A + m∠D = 180°

(70) + (x + 40) = 180

x + 70 + 40 = 180

x + 110 = 180

x + 110 - 110 = 180 - 110

x = 70

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~courtney

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