Q: What are the names for a parallelogram that has perpendicular sides?

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By definition, a parallelogram two separate pairs has parallel sides. The only type of parallelogram that has perpendicular sides is a rectangle. All others have non-perpendicular sides.

No. A parallelogram has two parallel sides.

Parallelogram.

Not normally but as a rectangle it has perpendicular sides that meet at right angles

100

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Square and rectangle.

A parallelogram with perpendicular sides is called a rectangle.

By definition, a parallelogram two separate pairs has parallel sides. The only type of parallelogram that has perpendicular sides is a rectangle. All others have non-perpendicular sides.

No. A parallelogram has two parallel sides.

A parallelogram doesn't necessarily have any perpendicular sides, but it can. If it has one single 90-degree angle, then it has four of them, and it's a rectangle or square. A parallelogram without perpendicular sides is a rhomboid or rhombus.

No. Not necessarily.

Parallelogram.

Not normally but as a rectangle it has perpendicular sides that meet at right angles

100

No.

Only in the special case when the parallelogram is a rectangle

A parallelogram doesn't necessarily have any perpendicular sides, but it can. If it has one single 90-degree angle, then it has four of them, and it's a rectangle.