[tex]A_{bilei} =4*\pi r^{2} = > 196\pi =4*\pi r^{2} = > r^{2}= 196\pi :4\pi = > r^{2} =49= > r=\sqrt{49} = > r=7 cm\\V_{bilei \frac{4*\pi r^{3} }{3} } = > V_{bilei \frac{4*\pi 7^{3} }{3} } = > V_{bilei \frac{4*\pi 343 }{3} } cm^{3}[/tex]Răspuns:
Explicație pas cu pas: