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V = 154 cm³
t = 12 cm
pake π = 22/7
Ditanyakan
r = ...?
Penyelesaian:
V = 1/3 . π . r² . t
154 = 1/3 . 22/7 . r² . 12
154 . 3 . 7/22 . 1/12 = r²
12,25 = r²
√12,25 = 3,5 cm
Jadi, jari-jarinya adalah 3,5 cm