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A rectangle is a quadrilateral with 4 sides and 4 right angles. A square is a special form of rectangle, and it meets that criterion. But it is also equilateral, meaning its sides are all the same length (are all equal). It is a rectangle or a square. A square is a special type of rectangle with all sides having equal length. Here is a a nice chart showing the quadralaterals. http://content.answers.com/main/content/wp/en/f/f1/Quadrilateral_hierarchy.png
A quadrilateral where each angle is a right angle is known as an oblong.

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7y ago

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