<PRE><B>Question 67488</B>
An isosceles right triangle is removed from each corner of a square piece of paper so that a rectangle remains. What is the length of a diagonal of the rectangle if the sum of the areas of the cut-off pieces is 200?
:
Each triangle has an area of 200/4 = 50: let x = length of the two equal sides of the triangle. 
:
Find x: 
.5(x^2) = 50
x^2 = 100
x = 10
:
The length of the side of the original square would be 2x or 20
:
The diagonal of the formed square would be the same, 20
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