document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=907668>Question 907668</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Given:<1 and <2 are supplementary <BR>\n" );
document.write( "<2 and <3 are congruent <BR>\n" );
document.write( "Prove: m<1+m<3=180 <BR>\n" );
document.write( "I need the statements and reasons and the reason have to be a poroperty.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #550480 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=550480\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Basic Idea\r<BR>\n" );
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document.write( "<1 and <2 are supplementary  ... given\r<BR>\n" );
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document.write( "<2 and <3 are congruent ... given\r<BR>\n" );
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document.write( "<1 + <2 = 180 ... angles 1 and 2 are supplementary \r<BR>\n" );
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document.write( "<2 = <3 ... since <2 and <3 are congruent\r<BR>\n" );
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document.write( "Since <1 + <2 = 180 and <2 = <3, we can replace the \"<2\" with \"<3\" to get <1 + <3 = 180. We are using the substitution property.\r<BR>\n" );
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document.write( "This isn't the formal proof, but it gives you an idea of how to do it.\r<BR>\n" );
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