document.write( "Question 1054249: Prove a quadrilateral with vertices G(1,1),H(5,3),I(4,5),J(0,3) is a rectangle. \n" ); document.write( "
Algebra.Com's Answer #669479 by Alan3354(69443)\"\" \"About 
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Prove a quadrilateral with vertices G(1,1),H(5,3),I(4,5),J(0,3) is a rectangle.
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\n" ); document.write( "Find the slope of GH, HI, IH & JG.
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\n" ); document.write( "If the adjacent lines are perpendicular it's a rectangle.
\n" ); document.write( "If and only if.
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