Q6 of 35 Page 74

If the length of the diagonal of a cube is 43 cm.,then let us calculate the total surface area of the cube.

Let the edge of a cube be a cm.

We know that the body diagonal of a cube = 3a cm


∴ According to question,


3 a = 43


a = = 4 cm


As, total surface area of a cube = 6a2 sq.cm


= 6×(4)2


= 6×16


= 96 sq. cm


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