Question

Aria bilei de lemn este de 36 pi centimetri pătrați aflați volumul bilei​

Answer 1

$\it \mathcal{A}=4\pi R^2 \Rightarrow 36\pi=4\pi R^2\Big|_{:4\pi} \Rightarrow R^2=9 =3^2\Rightarrow R=3\ cm\\ \\ \\ \mathcal{V}=\dfrac{4\pi R^3}{3}=\dfrac{4\pi\cdot3^3}{3}=\dfrac{4\pi\cdot27}{3}=4\pi\cdot9=36\pi\ cm^3$