document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=457435>Question 457435</A>: <I><SPAN STYLE=\"word-break: break-all;\"> why do the interior angles of a triangle add up to 180 ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #314134 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=314134\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28300%2C300%2C0%2C10%2C0%2C10%2C%0D%0A%0D%0A%0D%0Atriangle%282%2C2%2C8%2C2%2C3.5%2C7%29%2C%0D%0Aline%282%2C7%2C8%2C7%29%2C%0D%0Alocate%282.5%2C2.5%2CA%29%2C%0D%0Alocate%283.5%2C7%2CB%29%2C%0D%0Alocate%287.5%2C2.5%2CC%29%2C%0D%0Alocate%282.5%2C7%2CA%29%2C%0D%0Alocate%284.5%2C7%2CC%29%0D%0A%0D%0A%0D%0A%29%0D%0A ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Given the triangle with angles A,B,C we can draw a line through one vertex that is parallel to the base. Because the two lines are parallel, we can label the remaining angles A and C. Here it is clear that A+B+C = 180 since A,B, and C form a straight angle. </SPAN>\n" );
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