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When all 4 corners are right angles.

A parallelogram has two pairs of parallel sides. A rectangle has two pairs of parallel sides; therefore a rectangle is a parallelogram.

A rectangle also has four 90° angles; a parallelogram does not necessarily have four 90° angles, therefore a parallelogram may, or may not, be a rectangle.

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Q: When can a parallelogram be a rectangle?
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Related questions

How does a parallelogram relate to a rectangle?

A rectangle is a parallelogram but a parallelogram is not a rectangle. A rectangle needs all 90 degree angles but a parallelogram dosnt.


How is a parallelogram and a rectangle the same?

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