# In a parallelogram ABCD, angle A= x degree, angle B= 3x+20 degree, find x and find angle C and angle D plz answer it its very urgent....

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The Brainliest Answer!

Angle A + Angle B = 180°

(Adjacent angles of parallelogram)

x + 3x + 20° = 180°

4x = 180° - 20°

x = 160°/4

x = 40°

Now,

Angle A = x = 40°

Angle B = 3x +20° = 120°+20° = 140°

Angle A = Angle C = 40°

Angle B = Angle D = 140°

(Opposite angles in a parallelogram)

Since A and B are adjacent angles,

A+B= 180

Therefore

x+3x+20=180

4x=160

x=40

∴A=40

B=3x+20=3(40)+20=120+20=140

Since in a parallelogram diagonally opposite angles are equal,

A=C and B=D

Therefore

A=40

C=40

B=140

D=140

Hope it helped you!! :)