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22/7 x 9 x 9 x 21
= 5.346 cm^3

Dik:T=21 cm
d=18 cm
Dit:v=...?
Jawab:
[tex] r = \frac{1}{2}d \\ = \frac{1}{2} 18 \\ = 9 \\ v = \pi {r}^{2} t \\ = \frac{22}{7} \times {9}^{2} \times 21cm \\ = \frac{22}{7} \times 81 {cm}^{2} \times 21cm \\ =22 \times 81 {cm}^{2} \times 3cm \\ = 5346 {cm}^{3} [/tex]