document.write( "Question 664785: the proof is
\n" ); document.write( "Given: AB = CD
\n" ); document.write( "prove AC = BD\r
\n" ); document.write( "\n" ); document.write( "AB = CD
\n" ); document.write( "BC = BC
\n" ); document.write( "AB + BC = CD + BC
\n" ); document.write( "AB + BC = BD
\n" ); document.write( "BC + CD = AC
\n" ); document.write( "AC = BD
\n" ); document.write( "

Algebra.Com's Answer #413468 by Seutip(231)\"\" \"About 
You can put this solution on YOUR website!
I found a link for that one boy, http://mathforum.org/library/drmath/view/54669.html Hope that help.
\n" ); document.write( "
\n" ); document.write( "
\n" );