Find the radius of a hemisphere whose volume is numerically equal to its total surface area.
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Correct answer: A
Explanation
Volume of hemisphere = (2/3)πr³
Total surface area of hemisphere = 3πr²
(2/3)πr³ = 3πr²
2r/3 = 3
2r = 9
r = 9/2 = 4.5 units