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A rectangle has three rules:

-2 pairs of parallel sides

-four 90 degree angles

-2 pairs of congruent sides

A parallelogram has three rules:

-2 pairs of parallel sides

- 2 pairs of congruent angles

-2 pairs of congruent sides

The only difference is that a rectangle has 90 degree angles, which a parallelogram doesn't have. That's why a parallelogram can't be a rectangle. A rectangle follows all the rules of being a parallelogram, so it can be a parallelogram.

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Q: Why is a rectangle a parallelogram but a parallelogram is not a rectangle?
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