document.write( "Question 411716: given: ABCD is a parallelogram
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Algebra.Com's Answer #289342 by Edwin McCravy(20056)\"\" \"About 
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document.write( "given: ABCD is a parallelogram \r\n" );
document.write( "prove: < A congruent to < C, < B congruent to < D\r\n" );
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document.write( "Draw diagonal BD\r\n" );
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document.write( "AB parallel to CD                   opposite sides of a parallelogram\r\n" );
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document.write( "angle ABD congruent to angle CDB    alternate interior angles when transversal\r\n" );
document.write( "                                    BD cut parallel lines AB and CD\r\n" );
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document.write( "AD parallel to CB                   opposite sides of a parallelogram\r\n" );
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document.write( "angle ADB congruent to angle CBD    alternate interior angles when transversal\r\n" );
document.write( "                                    BD cuts parallel lines AD and CB\r\n" );
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document.write( "BD is congruent to itself\r\n" );
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document.write( "triangle ABD congruent to CDB       Angle Side Angle\r\n" );
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document.write( "Angle A congruent to angle C\r\n" );
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document.write( "Angle ADB + Angle CDB is congruent to\r\n" );
document.write( "Angle CBD + Angle ABD                   Sums of Congruent angles are Congruent\r\n" );
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document.write( "Angle ADC is congruent to Angle ABD      A whole angle is equal to\r\n" );
document.write( "                                         the sum of its parts\r\n" );
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document.write( "Edwin
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