[tex]4\pi r ^{2} \iff4 \times 3.14 \times 1 {8}^{2} \\ \iff4 \times 3.14 \times 324 \\ \iff \bf \: 803.84 \: {cm}^{2} [/tex]
[tex] \frac{4}{3} .\pi. {r}^{3} \iff \frac{4}{3} \times 3.14 \times {8}^{3} \\ \iff \frac{4}{3} \times 3.14 \times 512 \\ \iff \bf \: 2143.57 \: {cm}^{3} [/tex]
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apabila yang ditanya luas permukaan
[tex]4\pi r ^{2} \iff4 \times 3.14 \times 1 {8}^{2} \\ \iff4 \times 3.14 \times 324 \\ \iff \bf \: 803.84 \: {cm}^{2} [/tex]
apabila yang ditanya volume
[tex] \frac{4}{3} .\pi. {r}^{3} \iff \frac{4}{3} \times 3.14 \times {8}^{3} \\ \iff \frac{4}{3} \times 3.14 \times 512 \\ \iff \bf \: 2143.57 \: {cm}^{3} [/tex]