tolong ya pake cara ya, bsk dikumpulin :) tq

[tex]t = 2r \\ \pi {r}^{2} \times 2r = 180 \\ \pi {r}^{3} = \frac{180}{2} = 90 \\ \\ v \: bola = \frac{4}{3} \pi {r}^{3} \\ = \frac{4}{3} (90) = 120 \\ \\ v = 180 - 120 = 60[/tex]