document.write( "Question 1186350: Could you please help me write an INDIRECT PROOF for this problem?\r
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Algebra.Com's Answer #817314 by greenestamps(13200) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( "It's rather bizarre to ask for an indirect proof, since a direct proof is so easy.

\n" ); document.write( "But if that's what you need, we can do it that way.

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document.write( "BC and DC are not congruent                assumption\r\n" );
document.write( "AB is congruent to AD                      given\r\n" );
document.write( "angle ABC is congruent to angle DAC        given\r\n" );
document.write( "angle B is congruent to angle D            angles opposite congruent sides are congruent\r\n" );
document.write( "triangle BAC is congruent to triangle DAC  Angle-Side-Angle\r\n" );
document.write( "BC is congruent to DC                      corresponding parts of congruent triangles

\n" ); document.write( "That contradicts the assumption, so the assumption is false; BC is congruent to DC

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