A conical pile of sand has a base radius of 2 meters and a height of 3 meters. If each cubic meter of sand weighs 1.5 tons, how many tons does the pile of sand weigh?
一个圆锥形沙堆，它的底面半径2米，高3米，如果每立方沙重1.5吨，这堆沙重多少吨？
<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 * 3</gadget>
<output>12.56</output>

<gadget id="calculator">1.5 * 12.56</gadget>
<output>18.84</output>

<result>18.84</result>