Question

. In a parallelogram ABCD, A =x0 and /B =(3x+20)'. find C_and /D​

Answer 1

Any two adjacent angles of a parallelogram are supplementary.

So∠A+∠B=180

o

⇒x+3x+20=180⇒4x=160⇒x=40

So∠A=40

o

,∠B=3×40+20=140

o

Opposite angles of a parallelogram are equal.

So∠C=∠A=40 *

,∠D=∠B=140*

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