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# What are the characteristics of a rectangle?

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A rectangle is a simple shape that is characterized by having four sides at 90-degree angles to each other, and having both sets of opposing sides be the same length. Note that if all sides are equal to each other, the shape is not a rectangle, but a square.

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Credit: Thomas Leth-Olsen CC-BY-SA 2.0

A rectangle is one of the most common four sided two-dimensional shapes. It has both a length and a width dimension. Other four-sided shapes include squares, parallelograms and rhombuses. The area of a rectangle can be calculated by multiplying the length by the width while the perimeter can be calculated by adding up all the side lengths.

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