When a number is squared, it means that it is that number is multiplied by itself. So in this case it would be 9x9 which is equal to 81.
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3 squared is equal to 9
(a+b)(a+b)Also equal to a2+2ab+b2
4 m squared 1cm sqaured is equal to 0.0001m squared
144.
No, it equals 0. If you have nothing, and you multiply it by nothing, you still have nothing.