document.write( "Question 413660: How would you prove a rectangle is a rectangle when all you know is that the diagonals are congruent? \n" ); document.write( "
Algebra.Com's Answer #290243 by richard1234(7193)\"\" \"About 
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Not all quadrilaterals with congruent diagonals are rectangles. Draw an isosceles trapezoid, and you'll see.\r
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