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Rumus Volume tabung adalah πr²t
Diketahui = Volume tabung = 21.384
t = 21 cm
Ditanya = r atau jari-jari?
Jawab =
V tabung =πr²t
21.384 = 22/7 × r² × 21
21.384 = 66r²
21.384 : 66 = r²
324 = r²
√324 = r
18 = r
r = 18 cm
maka jari-jari alasnya adalah 18 cm