Question

In a parallelogram ABCD,D=140°.Find the mesure of A and B

Answer 1

as adjacent angles of parallelogram are supplementary
therefore
<D + <A = 180°
<A = 180° - 140°
<A = 40°
as opposite angles of parallelogram are equal
therefore
<D = <B
<B = 140°

Answer 2

I think it will help you thanks.