Being a rectangle with four equal sides is necessary and sufficient for being a square.

Name: Being a rectangle with four equal sides is necessary and sufficient for being a square.
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Quizplus · Accepted Answer

A square is a special type of rectangle that has all four sides of equal length, so having four equal sides (and right angles, as implied by being a rectangle) is both necessary (required for it to be a square) and sufficient (enough on its own to define it as a square).

Being a Rectangle with Four Equal Sides Is Necessary and Sufficient