document.write( "Question 353958: How do I prove that diagonals of a parallelogram bisect each other? \n" ); document.write( "
Algebra.Com's Answer #253046 by scott8148(6628)\"\" \"About 
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the opposite sides of a parallelogram are congruent (equal)\r
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\n" ); document.write( "\n" ); document.write( "the vertical angles formed by the intersection are congruent\r
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\n" ); document.write( "\n" ); document.write( "alternate interior angles from a line cutting two parallel lines are congruent\r
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\n" ); document.write( "\n" ); document.write( "find congruent triangles so that the halves of the diagonals are congruent sides
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