# CCSS IP Math I 6.1.1 Example 5

A square is a quadrilateral with two pairs of parallel opposite sides, consecutive sides that are perpendicular, and all sides congruent, meaning they have the same length.
Quadrilateral

*ABCD*has vertices*A*(–1, 2),*B*(1, 5),*C*(4, 3), and*D*(2, 0). Determine if this quadrilateral is a square.## New Resources

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