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MIT 21F Spanish I - IV (OCW)
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In quadrilateral ABCD, diagonals AC and BD bisect one another: What statement is used to prove that quadrilateral ABCD is a parallelogram?
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Angles BAD and ADC are congruent. corresponding angles BCD and CDA are supplementary. sides CD and DA are congruent. Triangles BPA and DPC are congruent.
i think its B because BCD 90 degrees + CDA 90 degrees = 180 degrees
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