The answer depends on what information you have about the cube. If, for example, you know the volume, V, then the surface area is 6*cuberoot(V)^2. If you have the lengths of an edge, s, then it is 6*s^2.
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First find the area of one of its faces then multiply it by 6 which will give the entire surface area of the cube.
surface area of cube=6*side*side =6*7.2*7.2
When asked to work out the lengths of its edges and its surface area.
There are 6 faces to a cube. So work out the area of one face and multiply by 6. For a 6 inch cube: 6 x 6 = 36 x 6 = 216in3.
Area of a cube = 6 X side X side since all sides of cube are equal.
Work it backwards.-- A cube has 6 faces.-- The area of each face is (150 / 6).-- The length of each side is sqrt(150/6).-- The volume of the cube is (side)3 = (150/6)3/2 = 125 cubic units