Question

Which is not a property of a parallelogram?
Answer

The diagonals bisect each other.

Contains four right angles.

Consecutive angles are supplementary.

The opposite sides are parallel.

Answer 1

2nd option,contains four right agles is incorect

Answer 2

A simple (non self-intersecting) quadrilateral is a parallelogram if and only if any one of the following statements is true
Each diagonal divides the quadrilateral into two congruent triangles with the same orientation.
The opposite sides are equal in length.
The diagonals bisect each other.
The opposite angles are equal in measure.
The sum of the squares of the sides equals the sum of the squares of the diagonals. (This is the parallelogram law.)
It possesses rotational symmetry.
One pair of opposite sides are parallel and equal in length.
Adjacent angles are supplementary.

Answer 3

Diagonals perpendicular