To find volume $ V $ use formula:
$$ V = \dfrac{ 4 \cdot r^2 \cdot \pi}{ 3 } $$After substituting $ r = \frac{ 1 }{ 4 } $ we have:
$$ V = \dfrac{ 4 \cdot \left(\frac{ 1 }{ 4 }\right)^2 \cdot \pi}{ 3 } $$ $$ V = \dfrac{ 4 \cdot \frac{ 1 }{ 16 } \cdot \pi}{ 3 }$$ $$ V = \dfrac{ \frac{ 1 }{ 4 } \cdot \pi}{ 3 }$$ $$ V = \frac{ 1 }{ 12 } \cdot \pi $$