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Rectangle

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A rectangle is a quadrilateral in which all angles are right angles. Every rectangle is a parallelogram and so has all the properties of a parallelogram. In addition, rectangles have congruent diagonals.

Squares are the only rectangles which are also rhombuses.


See Also

Area

British Flag Theorem

Ptolemy's Theorem This article is a stub. Help us out by expanding it.

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Looking for a challenging geometry text? Preparing for MATHCOUNTS or the AMC exams? Check out Art of Problem Solving's Introduction to Geometry by Richard Rusczyk.
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