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OpenStudy (anonymous):
The area of a square piece of cardboard is 81 square inches. What is the length of the cardboard?
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OpenStudy (anonymous):
9 inches because x^2=81 and x=9 inches :)
OpenStudy (apolloschariot):
square has equal sides and area is length*breadth or u can say that area of square is (side)^2 let side be L area is 81 81=(L)^2 9=L
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