The area of a square piece of cardboard is 81 square inches. what is the length of the cardboard? posted on December 26, 2021 THIS USER ASKED ๐ The area of a square piece of cardboard is 81 square inches. what is the length of the cardboard? THIS IS THE BEST ANSWER ๐ The square root of 81 is 9. 9 * 9 = 81. The length is 9 inches.
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