It is: 6*28*28 = 4704 square cm
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The area of a square with perimeter 28cm is: 49 cm2
Its edges will be 3 cm and so its total surface area is 3*3*6 = 54 square cm
If the lengths of the edges are x, y and z units, then the total surface area is 2*(xy + yz + zx).
A cube has six faces. Therefore, its surface area is 6 times a face's area.The area of a square whose edges measure 9 cm is 81 cm2.Therefore, the surface area of a cube whose edges measure 9 cm is 6*81 = 486 cm2.
Find the area of each face separately and then add them together for the total surface area.