Theorem: If figure ABCD is a rectangle, then the quadrilateral has four right vertex angles. Theorem: If ABCD is a rectangle, then AC = BD (diagonals are equal). Theorem: The diagonals of a square are perpendicular.
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Proof: Assume that figure ABCD is a rectangle. By definition, a rectangle is a quadrilateral with all four angles equal to 90 degrees. Therefore, each vertex angle of ABCD is a right angle. Hence, the theorem is proven. Show more…
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