If the total surface area of a hemisphere is 462 cm², calculate its radius.
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Correct answer: A
Explanation
Total Surface Area = 462 cm²
Total Surface Area of the Hemisphere = 3πr²
3πr² = 462
π = 22/7
⇒ 3 × (22/7) × r² = 462
⇒ (66/7) r² = 462
⇒ r² = 462 × 7 / 66
= 49
r = 7 cm