A conical pile of sand has a base radius of 3 meters and a height of 2 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，底面半径是3米，高2米．如果每立方米的沙重1.5吨，这堆沙共重多少吨？
<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>

<gadget id="calculator">1.5 * 18.84</gadget>
<output>28.26</output>

<result>28.26</result>