Question

Volumul unei sfere cu este egala cu 9 π supra 2 cm cm3.Raza sferei este egala cu ....

Answer 1

$V= \frac{4 \pi R^3}{3}. \\ \\ \frac{4 \pi R^3}{3}= \frac{9 \pi }{2} \Leftrightarrow \frac{4R^3}{3}= \frac{9}{2} \Leftrightarrow 8R^3=27 \Leftrightarrow R^3= \frac{27}{8} \Rightarrow R= \frac{3}{2}=1,5~(cm).$

Answer 2

$Vsf= \frac{4 \pi \cdot R^{3} }{3} = \frac{9 \pi }{2} \\ R^{3} = \frac{27}{8} \\ R= \frac{3}{2}$