Volume of a hemisphere is 19404 cu. cm. Its radius is :	Answers.
A) 19 cm
B) 20 cm
C) 21 cm
D) 30 cm
E) None
Sol.   Let the radius be R cm. Then,   2/3 * 22/7 * R³ = 19404 ⇔ R³   = [19404 * 21/44] = (21)³ ⇔ R = 21 cm.   Answer 21 cm
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Volume of a hemisphere is 19404 cu. cm. Its radius is :