document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1155104>Question 1155104</A>: <I><SPAN STYLE=\"word-break: break-all;\"> two-column proof<BR>\n" );
document.write( "Given: AD is a diameter of ⊙ O;<BR>\n" );
document.write( "Dc is tangent to ⊙ O at D.<BR>\n" );
document.write( "Prove: ∆ABD ~ ∆ADC\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #777829 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16949)</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=777829\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "In triangle ABD & ADC \r<BR>\n" );
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document.write( " ABD is congruent to angle ADC Both right angles<BR>\n" );
document.write( "(In ABD tangent perpendicular to radius<BR>\n" );
document.write( "ADC angle in a semi circle)\r<BR>\n" );
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document.write( "angle A is common in both triangles\r<BR>\n" );
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document.write( "Therefore ∆ABD ~ ∆ADC  ( AA test of similarity) </SPAN>\n" );
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