7292 = 531441 square cm
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729 squared is 531,441.
Yes an area problem must have an squared unit. Suppose: Find the area of a suare with side 8 cm. Thus, 8 squared will be 64cm. Your answer will be 64 squared cm.
Converting squared cm into regular cm does not make sense, one is an area and the other a linear length. But if you are referring to squared cm as an area and would like to find the side of a square which would enclose such area, then you can take the square root of the squared cm to get cm
Assuming the side of each cube is 9 cm, the surface area is 486 cm^2. The volume is 729 cm^3.
254.34 cm squared.