Mencari jari jari bola jika dik luas permukaan bola 100pi cm kuadrat

[tex]lp = 4 \times \pi \times {r}^{2} \\ 100\pi = 4 \times \pi \times {r}^{2} \\ {r}^{2} = \frac{100 \times \pi}{4 \times \pi} \\ {r}^{2} = \frac{100}{4} \\ {r}^{2} = 25 \\ r = \sqrt{25 } \\ r = 5cm[/tex]