Bearing in mind the a square is just a rectangle v all equal sides, thus, check the picture below.

You are watching: The area of a square piece of cardboard is 81 square inches. what is the length of the cardboard?

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Bearing in mind that a square is just a rectangle v all same sides, thus, examine the photo below.
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Lets x = next of squareArea the square = side times side = x * x = x^2Given: Area = 81 square inchessoA = x^281 = x^2x = √81x = 9Answerside = 9 inches
The price is B. 9 inches because a square has 4 equal sides. The area the a square amounts to length times width...So that way all 4 sides space 9 inches9x9=81
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