Given that the radius of the base of the cone is 3 cm and the height is 5 cm, find the volume of the cone.
已知圆锥的底面半径是3厘米，高5厘米，求圆锥的体积．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 5</gadget>
<output>47.1</output>

<result>47.1</result>