A conical pile of coal has a circumference of 18.84 meters and a height of 2 meters. If each cubic meter of coal weighs 0.5 tons, how many tons does the pile of coal weigh?
一个圆锥形煤堆，底面周长是18.84米，高是2米，如果每立方米煤重0.5吨，这堆煤共重多少吨？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">18.84 / 6.28</gadget>
<output>3</output>

<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 * 0.5</gadget>
<output>9.42</output>

<result>9.42</result>