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

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the answer is 9 inches

9 inches

answer is D. 9 inches

9.

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.

It has 156 cubic inches

9 inches

9 inches

Inches

12 inches

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

24 inches

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A linear foot is a length 12 inches long, the length of a 12 inch ruler or a 12 inch long piece of string for example. A square foot could be a square having a length of 12 inches on each side, it could be a rectangle having a length of 36 inches and a width of 4 inches, or it could be a circle, a triangle, or any other shape enclosing 144 square inches of area.

If cutting off 5 inches left 4 inches, then the original length of one piece was 9 inches. The other piece was also 9 inches. Therfore the original piece of construction paper was 18 inches

3 inches is the length of something, like a piece of string or spaghetti.3 square inches is the area that something covers, like a postage stamp, a playing card, or a puddle.

Lay out or stand up the piece you're interested in. -- Take out your tape and your calculator. -- Measure the length of the piece, in inches. -- Then measure the width of the piece, in inches. -- Multiply the two numbers. -- Divide the product by 144. The result is now the square footage of the piece or area you measured

Sigh... 9 if it's square 'cos 81 = 9 x 9

192 square inches!

It's not a matter of converting. It's a matter of deciding what you are going to measure. Inches measure length. An ordinary desk ruler is 12 inches in length. A yardstick, three feet, is 36 inches long. Square inches measure an area, not a length. The area of an ordinary standard (8.5 inches by 11 inches) piece of printer paper is calculated by multiplying the two dimensions together: 11 X 8.5 = 93.5 square inches.

10.24 square units.

8 inches x 8 inches = 64 square inches = the area of the piece of paper. Length and width are used to find the area of an object, not the volume (cubic inches). To find the volume of the piece of paper you need to know the depth of the sheet of paper. You might be able to find this out with a Google search.

for action figures you can cut some cardboard and put it in tinfoil ladders you can cut a long piece of cardboard and fold it and chairs a little square of cardboard

93.5 square inches (for an 8.5" x 11" sheet).