document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=670728>Question 670728</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Here is the picture I made to go along with this: http://tinypic.com/r/14n0ifc/6\r<BR>\n" );
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document.write( "Given: AB || CD ; BC || CD<BR>\n" );
document.write( "Prove: angle B is congruent to angle D\r<BR>\n" );
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document.write( "Please help as soon as possible, & thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #417083 by </B><A HREF=/tutors/aboutme.mpl?userid=vleith><B>vleith(2983)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vleith><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=417083\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use the fact there are two sets of parallel lines to prove this.<BR>\n" );
document.write( "First, use alternate interior angles to show angle B is equal to angle C. <BR>\n" );
document.write( "Then use a different set of alternate interior angles using the other set of parallel lines to show angle C is also equal to angle D.\r<BR>\n" );
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document.write( "If B=C and C=D, then B=D\r<BR>\n" );
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document.write( "http://www.mathsisfun.com/geometry/alternate-interior-angles.html </SPAN>\n" );
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