A cone-shaped pile of sand has a diameter of 4 meters at the bottom and a height of 3 meters. If the sand weighs 1.5 tons per cubic meter, how many tons does the pile of sand weigh?
一个圆锥形沙堆，底面直径是4米，高3米，如果每立方米沙重1.5吨，这堆沙大约重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</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">12.56 * 1.5</gadget>
<output>18.84</output>

<result>18.84</result>