document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=721940>Question 721940</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how do i prove an altitude? What are the steps to doing this in a coordinate geometry question where they ask you to prove that line CD in triangle ABC is an altitude and is bisecting the base of the triangle. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #442571 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=442571\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> CD is bisecting the base<BR>\n" );
document.write( "find co-ordinates of D by mid point formula.\r<BR>\n" );
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document.write( "You have to prove CD as altitude.\r<BR>\n" );
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document.write( "Apply Pythagoras theorem.\r<BR>\n" );
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document.write( "show that AC^2-AD^2=CD^2\r<BR>\n" );
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document.write( "by distance formula\r<BR>\n" );
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