Assuming you mean 3 cm per edge.
1 side = 3 x 3 = 9 sq cm.
6 sides total = 9 x 6 = 54 sq cm.
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54 cm2
The area of one face of a 3cm cube is the area of a 3cm square. That's 3 x 3 = 9cm2.
54 cm2
I thought the answer was: 6 x 3squaredcmsquared
3cm, 3cm and 3cm respectively