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V= phi x r kuadrat x t
6930= 3,14 x r kuadrat x 5
6930= 15,7r kuadrat
6930/15,7= r kuadrat
441= r kuadrat
21 cm= r
ket: 441 diakarin
t = 5 dm
dit : r = ??
jawab :
V = π . r² . t
⇔ r² = 6930 / (22/7 . 5)
⇔ r² = 2205 / 5
⇔ r² = 441
⇔ r = 21 cm²
jadi jari-jarinya adalah 21 cm