The total surface area of the cube is 294 cm2 The volume of the cube is 343 cm3
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Area of one face - 64cm2 Volume of whole cube - 512cm3
The edge lengths are 4.082 cm
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The length of the edge is 7 cm
A cube has six faces and each edge as you say measures 4.5 cm. Area of one face is 4.5 x 4.5 square cm, so six faces would be 6 x 4.5 x 4.5 = 121.5 sq cm