Question

Quadtrilateral BEST is a parallelogram. If m∆B = (×+40) and m∆E = (2×+20), what is the m∆B? A.50 B.60 C.70 D.80. With solution.​

Answer 1

Step-by-step explanation:

In a parallelogram,

Adjacent angles are supplementary.

Therefore,

m(angle B) + m(angle E) = 180°

x+40 + 2x+20= 180

3x + 60 = 180

3x = 180 - 60

3x = 120

x = 120/3

x=40

m(angle B) = x+40

= 40 + 40

m(angle B) = 80°