document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=33432>Question 33432</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am stuck on this proof. It is: <BR>\n" );
document.write( "Prove: If an Isosceles triangle has an altitude from the vertex to the base, then the altitude bisects the vertex angle.<BR>\n" );
document.write( "Given: Triangle ABC is isosceles; Segment CD is teh altitude to base Segment AB.<BR>\n" );
document.write( "To prove:Segment CD bisects Angle ACB\r<BR>\n" );
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document.write( "This is a problem our teacher gave us to do and i don't understand how to write proofs and i was wondering if you could help me. Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #19793 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=19793\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Need to prove angle ACD= angle BCD<BR>\n" );
document.write( "angle CDA is a right angle because of definition of altitude<BR>\n" );
document.write( "angle BDA is a right angle because of definition of altitude<BR>\n" );
document.write( "Therefore angle CDA= angle BDA<BR>\n" );
document.write( "angle A = angle B because they are opposite equal sides of a isos. triangle<BR>\n" );
document.write( "Therefore angle ACD = angle BCD because the other corresponding angles are equal.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );