If you are referring to a rectangular prism then the surface area = 594 square units.
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Surface area = 2*(12*8 + 8*9 + 9*12) sq cm = 2*(96 + 72 + 108) = 552 cm2
Entire surface area = (2*pi*92)+(18*pi*12) = 1187.522 square units to 3 d.p. .
The surface area of a 9 centimeter cube is: 486 cm2
the awnser is 552 ok :)
The sphere's surface area is ~1,017.9 square units.