Total surface area of cube is 54 cm^2. Then its side is ………… cm. A) 6 B) 9 C) 12 D) 3
Total surface area of cube is 54 cm2. Then its side is ………… cm.
A) 6
B) 9
C) 12
D) 3
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Correct option is: D) 3
Let side of the cube be a.
\(\therefore\) T..S.A of the cube is 6 \(a^2\)
Given that T.S.A of the cube is 54 \(cm^2\) .
\(\therefore\) 6 \(a^2\) = 54
= \(a^2\) = \(\frac {54}6 = 9 = 3^2\)
\(\therefore\) a = 3 cm
Hence, the side of the cube is 3 cm.
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