A conical sand pile, the radius of the bottom surface is 3m, and the height is 2m, what is the volume of this sand pile in m**3.
一个圆锥形沙堆，量得底面半径是3m，高是2m，这个沙堆的体积是多少m**3．
<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 * 2</gadget>
<output>18.84</output>

<result>18.84</result>