![]() The key to this proof (and probably most proofs about quadrilaterals) is a theorem about triangles. Opposite sides of a parallelogram are congruent (1) ![]() Given that ABCD is a parallelogram, prove that its diagonals, AC and BD, bisect each other. Or, if you'd rather not, you can get the theorem for free! Just handle it yourself. But wait, there's more! Order in the next ten minutes and we'll throw in another theorem, absolutely free! Just pay $4.95 for shipping and handling. With all of these theorems about parallelograms, it's like we struck mathematical gold. So ∠ A and ∠ B are supplementary, as are ∠ C and ∠ D.
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