document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1075360>Question 1075360</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Write a proof that shows vertical angles are congruent.<BR>\n" );
document.write( "Note: You cannot use the Vertical Angle Theorem as your proof.<BR>\n" );
document.write( "Use either a paragraph or two-column proof. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #690037 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=690037\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Without being able to easily draw,<BR>\n" );
document.write( "Make two parallel lines cut by a transversal.<BR>\n" );
document.write( "Let the alternate interior angles be a and b.  They are equal.<BR>\n" );
document.write( "Let angle c be an interior angle on the same side as angle a.<BR>\n" );
document.write( "Let angle d be a corresponding angle to angle a<BR>\n" );
document.write( "Angle d is supplementary to angle c<BR>\n" );
document.write( "Angles b and d by definition are vertical angles <BR>\n" );
document.write( "Therefore angle d equals angle b and by extension to angle a.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );