Question

all parallelograms have two sets of congruent sides. is this true of quadrilaterals?

Explanation:

Step1: Recall parallelogram definition

A parallelogram is a quadrilateral with two - pairs of parallel sides. By its properties, opposite sides of a parallelogram are congruent, so it always has two sets of congruent sides.

Step2: Consider general quadrilaterals

A general quadrilateral can have all sides of different lengths (scalene quadrilateral), so it does not always have two sets of congruent sides.

Answer:

sometimes