In parallelogram ABCD, `angle A- angle B` =`30degree` then find `angle C​`?

In parallelogram ABCD, find angle B, angle C and angle D.

In Parallelogram ABCD , angle A=x^@ and B= (3x+20)^@ , then find x.

In a parallelogram ABCD, angleA = 115 degree. The measure of angle D is equal to

square ABCD is a parallelogram. If angle A =3x and angle C =120^@ then find the value of x.

In parallelogram ABCD,angle A=60^(@) Then find angle B,C,D,

In parallelogram ABCD, the angle bisector of angle A bisects BC. Will angle bisector of B also bisect AD? Give reason.

In parallelogram ABCD, bisectors of angles A and B intersect each other at "O" the value of angle AOB is.

In parallelogram ABCD, diagonals AC and BD are equal. Find the measure of angle ABC and prove that the quadrilateral ABCD is a rectangle.

In a parallelogram ABCD, the sum of any two consecutive angles is 180^(@) and opposite angles are equal. In a parallelogram ABCD, angleD=115^(@) , determine the measure of angleA and angleB