There is wooden sphere of radius  cm. The total surface area of the largest possible cube cut out from the sphere will be:

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SSC GD Constable (2022) Official Paper (Held On : 23 Jan 2023 Shift 3)
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  1. 540 cm2
  2. 900 cm2
  3. 600 cm2
  4. 5,400 cm2

Answer (Detailed Solution Below)

Option 4 : 5,400 cm2
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Detailed Solution

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Given:

The radius of the sphere, r = 15√3 cm

Concept:

The total surface area of a cube = 6 ×  (edge length)2.

Length of the main diagonal of  cube = (edge length)√3

Solution:

The diameter of the sphere = Length of the main diagonal of the cube.

2 ×  = a√3 

a = 30 cm

Total surface area of the cube = 6 ×  (edge length)2

Total surface area of the cube = 6 × (30)2 = 5400 cm2.

Hence, the total surface area of the largest possible cube cut out from the sphere will be 5400 cm2.

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