Itself.
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You multiply the number by itself.You multiply the number by itself.You multiply the number by itself.You multiply the number by itself.
If you have a number of square feet, divide it by 43,560 or multiply it by 0.00002296 to get the number of acres.If you have a number of acres, multiply it by 43,560 or divide it by 0.00002296 to get the number of square feet.
There are none. Negative numbers don't have square roots. Well, they do, but they are known as imaginary numbers, and there is no way to determine them. A square root of a number is a number you can multiply by itself and get the original number. There is no number you can multiply by itself to get a negative number, but every positive number has two square roots of the same absolute value.
To convert square miles to square feet, multiply the number of miles by 27878400
169 square feet. Multiply the two dimensions - the result is the number of square feet.