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ABCD is a parallelogram. Given that m A = and mZC = + 10, find the measure of angle B. a) 142° b) 140° c) 40° d) 1450 e) 1410need help solving this

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Answer #1

A 15 Properties of parallelogram du) LA = mee j) mLA + ALB = 180° / Supplementary angles I r | MLA = ncc 22- x+20 3 2 un= 3x30 mLA = upstinaf T MLA - 25. 3 no no - naomcat MLB = Meßz B = = 180 180° - Mza 1402 loprim (b)

We used two properties of parallelogram here

1) the opposite angles of parallelogram are equal so angle A =angle C.

2)the sum of two adjacent angles of a parallelogram is 180 because they are supplementary angle so angleA + angleB = 180.

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