Volume 1/2 bola = V.kerucut
[tex] \tt \frac{1}{2} \times \frac{4}{3} \times \pi \times r {}^{3} = \blue{\bold{n \times \frac{1}{3} \times \pi {}^{2} \times t}}[/tex]
[tex] \tt\frac{1}{{ \cancel{2}}} \times \frac{{ \cancel{4}}}{3} \times 3.14 \times { \cancel{r {}^{2} }} \times r = \blue{\bold{n \times \frac{1}{3} \times { \cancel{\pi}} \times { \cancel{r {}^{2} }} \times t}}[/tex]
[tex] \tt \frac{2}{{ \cancel{3}}} \times r = \blue{\bold{n \times \frac{1}{{ \cancel{3}}} \times t}}[/tex]
[tex] \tt2r = n \times t[/tex]
[tex] \tt2(18) = n \times { \cancel{18}}[/tex]
[tex] \tt \: n = 2[/tex]
Jadi, pernyataan yang benar adalah pilihan (A). Agar setengah bola berisi penuh pasir maka banyak kerucut yang diperlukan 2 buah
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Penyelesaian:
Volume 1/2 bola = V.kerucut
[tex] \tt \frac{1}{2} \times \frac{4}{3} \times \pi \times r {}^{3} = \blue{\bold{n \times \frac{1}{3} \times \pi {}^{2} \times t}}[/tex]
[tex] \tt\frac{1}{{ \cancel{2}}} \times \frac{{ \cancel{4}}}{3} \times 3.14 \times { \cancel{r {}^{2} }} \times r = \blue{\bold{n \times \frac{1}{3} \times { \cancel{\pi}} \times { \cancel{r {}^{2} }} \times t}}[/tex]
[tex] \tt \frac{2}{{ \cancel{3}}} \times r = \blue{\bold{n \times \frac{1}{{ \cancel{3}}} \times t}}[/tex]
[tex] \tt2r = n \times t[/tex]
[tex] \tt2(18) = n \times { \cancel{18}}[/tex]
[tex] \tt \: n = 2[/tex]
Jadi, pernyataan yang benar adalah pilihan (A). Agar setengah bola berisi penuh pasir maka banyak kerucut yang diperlukan 2 buah