[]ABCD is a
parallelogram. If angle A = (2x-30)° and
angle D =(2x+10)° find angle B.
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Answer:
Step-by-step explanation:
∠A = 2x - 30
∠D = 2x + 10
∠B = x
∠C = x
2x - 30 + 2x + 10 + x + x = 360
2x - 2x - 30 + 10 + x + x = 360
-30 +10 + 2x = 360
-20 + 2x = 360
2x = 360+20
→ 2x = 380
→ x = 380/2
→ x = 190°
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