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A quadrilateral is any plane figure bounded by four straight lines.

There are no conditions in this definition that specify if any or all of the lines are of equal length or parallel, or if any or all of the interior angles are equal. When these conditions are applied then the quadrilateral so formed is usually given a special name.

A rectangle is a special type of quadrilateral. It has both pairs of opposite sides parallel, opposite sides are of equal length and each of the vertex (interior) angles equals 90°.

All quadrilaterals are therefore not rectangles - just some of them.

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Q: Are all quadrilaterals rectangles why or why not?
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