A conical sand pile has a base radius of 2m and a height of 1.5m. How much is the pile of sand in m**3.
一个圆锥形沙堆，底面半径是2m，高时1.5m，这堆沙子有多少m**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 1.5</gadget>
<output>6.28</output>

<result>6.28</result>