The width of a piece of paper was 1/2. The area of the paper was 9/16. What was the length of the paper?
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In this equation, there is nothing to solve for. However, the expression 
is the Pythagorean theorem. If there is a right triangle, then when the lengths of two shorter legs (a and b) are added together, and then square rooted, you get c, which is the hypotenuse.
Hope this helps!
Hope this helps!