Which of the following is not true about every parallelogram?

Question

Two pairs of congruent sides
Two pairs of parallel sides
Regular polygon
Quadrilateral
Some of interior angles is 360°

Answer 1

The statement that is not true about every parallelogram is:

Regular polygon

A parallelogram can be a rectangle, rhombus, or square, but it is not necessarily a regular polygon unless its sides and angles are all equal, which is not true for all parallelograms. The other statements are true for every parallelogram.