Question

In a quadrilateralABCD , sum of angle A and angle B is 2 times angle B angle + angle D.If angle A =140* and angle D = 60* then angle B=​

Answer 1

Answer:

B = 20°

Step-by-step explanation:

Given that,

A = 140° , D = 60°

A + B = 2(B + D)

140° + B = 2(B + 60)

140° + B = 2B + 120°

140° - 120° = 2B - B

20° = B