Understanding Q...

If in quadrilateral $$ABCD$$, $$AB \parallel CD$$, then $$ABCD$$ is necessarily a

Complete the following statement .

Two adjacent angles of a parallelogram are in the ratio 1 : 2. The angles are

How many sides does a polygon have whose sum of the interior angles is $${1980}^{o}$$?

Under what conditions must $$PQRS$$ be a parallelogram?

ABCD is a parallelogram. The angle bisectors of $$\angle$$ A and $$\angle$$D meet at O. The measure of $$\angle$$AOD is:

Which of the following properties need not be true for a parallelogram?

If $$ABCD$$ is a parallelogram with diagonals intersecting at $$O$$, then the number of distinct pairs of congruent triangles formed is:

Find the angles of a parallelogram if one angle is three times another.

$$ABCD$$ is a parallelogram. IF $$P$$ be a point on $$CD$$ such that $$AP=AD$$, then the measure of $$\angle PAB+\angle BCD$$ is: