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Best Answer

Ok.

The area A = 81 in^2

It's a square hence L*L=A

or L^2=A

Taking the square root of both sides

L=sqrt(A)=sqrt(81)=9 inches

Hence the length is 9 inches.

Good luck.

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Q: The area of a square piece of cardboard is 81 squre inches What is the length of the cardboard?
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