IN MATH: 1. n. a polygon having 4 sides. EX. A square is a regular quadrilateral.

IN ENGLISH: 1. as defined above.

APPLICATION: See list 140.

- Name all the types of quadrilaterals which have:
- 1. four right angles, two pairs of parallel sides.
- 2. two pairs of parallel sides.
- 3. only one pair of parallel sides.
- 4. four congruent sides.

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