document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1173739>Question 1173739</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove that quadrilateral A(1,-2), B(13,4), C(6,8) and D(-2,4) is a trapezoid, but is not an isosceles trapezoid. </SPAN>\n" );
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document.write( "Proving two sides parallel makes it a trapezoid.  A rough sketch of the four points shows that probably sides AB and CD are parallel.  Confirm that by showing their slopes are equal.<br><BR>\n" );
document.write( "Then showing that sides AD and BC are different lengths proves that the trapezoid is not isosceles.  That is easily shown using the distance formula.<br><BR>\n" );
document.write( "You can do the simple calculations....<br><BR>\n" );
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