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Mathematics 9 Online
OpenStudy (anonymous):

Given: A rhombus is a quadrilateral with 4 congruent sides. Prove: If quadrilateral ABCD does not have 4 congruent sides, then it is not a rhombus. Determine the first step to prove this statement using proof by contradiction. A. Assume ABCD does not have 4 congruent sides and is a rhombus. B. Assume ABCD has 4 congruent sides and is not a rhombus. C. Assume ABCD has 4 congruent sides and is a rhombus. D. Assume ABCD is not a rhombus.

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