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SSC CHSL 2024 PYQ — Question 55

SSC CHSL - 02 July 2024 Shift 1 • Quantitative Aptitude • Q55

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If the diameter of a hemisphere is 21 cm, then the curved surface area (in cm2) of the hemisphere is: Take π=227\pi = \frac{22}{7}

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Correct answer: A

Explanation

The correct answer is option 1 i.e. 693.

The curved surface area of a hemisphere is given by the formula:

CSA = 2πr2^2

where r is the radius of the hemisphere.

The diameter of the hemisphere is given as 21 cm. So, the radius of the hemisphere is 21/2 = 10.5 cm.

Substituting the value of r in the formula, we get:

CSA = 2π × (10.5)2^2

CSA = 2 × π × 110.25

CSA ≈ 693.15 cm2^2  

Therefore, the curved surface area of the hemisphere is approximately 693.15 cm2^2   .