If the area of a face of cube is 20 cm2, then the total surface area of the cube is

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120cm2

125cm2

130cm2

140cm2

answer is A.

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Detailed Solution

It is given a cube.
We know that, area of a cube = a².
Total surface area of a cube = 6a².
It means that total surface area of a cube is 6 times the area of a cube.
So,

TSA = 6 × 20 ⇒ 120 c m 2

.
Thus, Total surface area of the cube is 120 cm2.
Therefore, the correct option is 1.

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