7x3 = 21 Simple arithmetic.
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7 metres squared = 8.372 sq yards.
28m2
3 to 7
7^2 + 3^2 = 58
it`s 81. Anything squared means timed the number you`re timing it with. For example. 7 squared= 7 times 7 3 squared= 3 times 3. Hope I helped! (^_^)