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-_- ' *sigh* 3x1,5 = 4.5
Every one of them could be a side of a rectangle. It is not possible to give an answer in respect of an unspecified rectangular object. however, i feel the question is incorrect as it should be sides of the triangle and according to it 3rd is the answer as 3+5<9 :)
3m*3m*2m=300*300*200=18,000,000cm3
4 + 3m is already in its simplest form.
It is 9m^2 - 9 = (3m + 3)*(3m - 3).