Question

Which among the following is sufficient to prove that a quadrilateral is a parallelogram?

• A. Opposite sides are equal.
• B. Opposite sides are parallel.
• C. Adjacent angles are supplementary.
• D. Diagonals bisect each other at ${90}^{\circ }$

Answer 1

Answer: (A), (B)

The correct options are
A

Opposite sides are equal.

B

Opposite sides are parallel.

In order to prove that given quadrilateral is a parallelogram, show that

Opposite sides are equal.

or

Opposite sides are parallel.

or

A pair of opposite sides is equal and parallel.

or

Diagonals bisect each other.

or

Opposite angles are equal.