SOLUTION: How would you prove a rectangle is a rectangle when all you know is that the diagonals are congruent?

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Question 413660: How would you prove a rectangle is a rectangle when all you know is that the diagonals are congruent?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Not all quadrilaterals with congruent diagonals are rectangles. Draw an isosceles trapezoid, and you'll see.