Jawaban:
1. a. 628 cm³
b. 3,080 cm³
c. 34,650cm³
2. 20 cm
3. 2,260.8 cm³
Penjelasan:
1. a.
[tex]V = \pi.{r}^{2}.t \\ = 3.14 \times {5}^{2} \times 20 \\ = 3.14 \times 200 \\ = 628 \: {cm}^{3} [/tex]
b.
[tex]V = \pi. {r}^{2}.t \\ = \frac{22}{7} \times {7}^{2} \times 20 \\ = 22 \times 7 \times 20 \\ = 3080 \: {cm}^{3} [/tex]
c.
[tex]V = \pi. {r}^{2}.t \\ = \frac{22}{7} \times {21}^{2} \times 25 \\ = 1386 \times 25 \\ = 34650 \: {cm}^{3} [/tex]
2.
[tex]V = \pi. {r}^{2}.t \\ 1570 = 3.14 \times 5 \times t \\ 1570 = 78.5 \times t \\ t = \frac{1570}{78.5} \\ t = 20 \: cm[/tex]
3.
[tex]V = \pi. {r}^{2}.t \\ = 3.14 \times {6}^{2} \times 20 \\ = 3.14 \times 36 \times 20 \\ = 113.04 \times 20 \\ = 2260.8 \: {cm}^{3} [/tex]
"Semoga bermanfaat~"
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