SSC MTS 2024 · PYQ · Mensuration · medium
What is the height of a solid right circular cylinder of radius 21 cm if its total surface area is 3828 cm² (use π = 22/7)?
Answer
The correct answer is C: 8 cm. TSA = 2πr(h+r): 2×(22/7)×21×(h+21) = 3828, so 132(h+21) = 3828, h+21 = 29, h = 8 cm.
- A.6 cm
- B.12 cm
- C.8 cm✓ Correct
- D.10 cm
TSA = 2πr(h+r): 2×(22/7)×21×(h+21) = 3828, so 132(h+21) = 3828, h+21 = 29, h = 8 cm.
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