document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=391009>Question 391009</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove: if diagonal of a parallelogram bisects an angle of the parallelogram, then the parallelogram is a rhombus.(state plan and give proof)\r<BR>\n" );
document.write( "\n" );
document.write( "Given: ABCD is a parallelogram with <1 congruent <@.\r<BR>\n" );
document.write( "\n" );
document.write( "To prove: ABCD is a rhombus.\r<BR>\n" );
document.write( "\n" );
document.write( "Plan:__________________?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "i need help with the proofs and reasons...im not very good at this at all! thank youu so much\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Heres a picture!<BR>\n" );
document.write( "http://i1189.photobucket.com/albums/z426/cwallace2/Casey002.jpg </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #277438 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=277438\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Since AD || BC, angle 1 = angle 3, so you can replace the \"3\" with a \"1.\" Also, since angle 2 = angle 1 (already given), AB = BC, and since AB = CD and BC = AD (the parallel sides of a parallelogram are congruent), all four sides are congruent to each other and it's a rhombus.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "I almost never use the two-column proof when writing solutions to proof problems...it helps you back up each statement with a reason, but virtually no mathematicians use the two-column proof when explaining a proof(e.g. in a paper). </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );