Question

The area of a square piece of cardboard is 81 in.² what is the length of the cardboard

Answer 1

the area of a square is length x width, as 81 is a square number we know that 9 x 9 is 81 meaning the length is 9

Answer 2

81 inches squared=9 inches in length because the height equals 9 and with equals 9 multiply 9x9=81 so the length of the cardboard is 9 inches