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A quadrilateral is a generic term used to describe a four sided polygon. In other words, it is a shape that has four sides.

A rectangle, rhombus, parallelogram and trapezium (trapezoid) has four sides. In light of this, it can be classified as a quadrilateral but, if the quadrilateral has no sides and angles equal, it could not be classified as any of the foregoing.

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12y ago
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Q: Why can a quadrilateral not be called a parallelogram a rectangle a rhombus or a trapezoid?
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