Question

[]ABCD is a
parallelogram. If angle A = (2x-30)° and
angle D =(2x+10)° find angle B.​

Answer 1

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°