Find the total surface area of cubes having following sides-(a) 3 cm(b) 5 cm(c) 5.5 cm

# Find the total surface area of cubes having following sides-(a) 3 cm(b) 5 cm(c) 5.5 cm

1. A
54 cm2, 170 cm2, 180.5 cm2
2. B
54 cm2, 150 cm2, 181.5 cm2
3. C
150 cm2, 158 cm2, 130.5 cm2
4. D
54 cm2, 150 cm2, 113.5 cm2

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### Solution:

(a) given length = 3 cm
Surface area of cube = 6a2
= 6(3)2 = 54 cm2
Hence, the total surface area of the cube is 54 cm2.
(b) Given, a = 5 cm
Surface area of cube = 6a2
= 6(5)2 = 150 cm2
Hence, the total surface area of the cube is 150 cm2.
(c) Given a = 5.5 cm
surface area of cube = 6a2
= 6(5.5)2 = 181.5 cm2
Hence, total surface area of cube is 181.5 cm2
Hence option (2) is correct.

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