document.write( "Question 1019001: Prove the theorem that states that if AD/DB=AE/EC, then DE||BC \n" ); document.write( "

Algebra.Com's Answer #635016 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "Prove the theorem that states that if AD/DB=AE/EC, then DE||BC
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document.write( "The Theorem formulation is as follows:\r\n" );
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document.write( "   If in a triangle a straight line connects two sides and cuts off proportional segments in the triangle sides, \r\n" );
document.write( "   then this straight line is parallel to the third side of the triangle. \r\n" );
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document.write( "See the lesson In a triangle a straight line parallel to its side cuts off a similar triangle in this site, Theorem 2.\r\n" );
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