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.

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

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It has 156 cubic inches

9 inches

12 inches

Area of a square is length2. Therefore length is square root of 20 which is 4.47 inches

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It has 156 cubic inches

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To find the number of square inches on a piece of paper multiply the width by the length. So to answer this question multiply 8.5 by 11. The answer is 93.5 square inches.

Area of a square is length2. Therefore length is square root of 20 which is 4.47 inches