To find volume $ V $ use formula:
$$ V = \dfrac{ 4 \cdot r^2 \cdot \pi}{ 3 } $$After substituting $ r = 10 $ we have:
$$ V = \dfrac{ 4 \cdot 10^2 \cdot \pi}{ 3 } $$ $$ V = \dfrac{ 4 \cdot 100 \cdot \pi}{ 3 }$$ $$ V = \dfrac{ 400 \cdot \pi}{ 3 }$$ $$ V = \frac{ 400 }{ 3 } \cdot \pi $$