Explicație pas cu pas:
[tex]1 \frac{32}{49}= \frac{1 \times 49 + 32}{49} = \frac{81}{49} [/tex]
[tex]S = \pi {r}^{2} = > \pi {r}^{2} = \frac{81}{49} \pi \\ {r}^{2} = \frac{81}{49} = > r = \frac{9}{7} [/tex]
[tex]A=4\pi {r}^{2} = 4\pi \times \frac{81}{49} = \frac{324\pi}{49} \\ = > A = 6 \frac{30}{49} \pi \: {m}^{2} [/tex]
[tex]V= \frac{4}{3} \pi {r}^{3} = \frac{4 \times {9}^{3} }{3 \times {7}^{3} }\pi = \frac{972}{343}\pi \: {m}^{3} \\ = > V=2 \frac{286}{343} \pi \: {m}^{3}[/tex]
