# Why is every rectangle a quadrilateral?

A quadrilateral is any polygon with four sides.

A rectangle, by definition, is a polygon with four sides and four right angles.

Every rectangle is a quadrilateral because all rectangles must have four sides, which is the definition of a quadrilateral.

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Every rectangle is a quadrilateral because a rectangle, by definition, is a type of quadrilateral. A quadrilateral is a polygon with four sides and four angles. A rectangle is a specific type of quadrilateral where all angles are right angles (90 degrees). So, since a rectangle has four sides and four right angles, it fits the definition of being a quadrilateral.

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