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Is ABCD a rectangle?

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Is ABCD a rectangle?

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Given: ∠ABC is a right angle Conclusion: ABCD is a rectangle. If one angle of a parallelogram is a right angle, then the parallelogram is a rectangle. ... The diagonals are congruent, so ABCD is a rectangle. Since ABCD is a rhombus and a rectangle, it is also a square.

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