A conical sand pile has a height of 1.8m and a radius of the bottom surface of 2m. How much is the pile of sand in m**3.
一个圆锥形沙堆，高是1.8m，底面半径是2m，这堆沙有多少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 * 1.8</gadget>
<output>7.536</output>

<result>7.536</result>