Given that the radius of the base of the cone is 4 cm and the height is 15 cm, find its volume.
已知圆锥的底面半径是4厘米，高是15厘米，求它的体积．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 15</gadget>
<output>251.2</output>

<result>251.2</result>