A batch of coal is piled into a conical shape, the circumference of the bottom surface is 18.84 meters, and the height is 1.2 meters. If each cubic meter of coal weighs 1.4 tons, how many tons does this pile of coal weigh?
一批煤堆成一个圆锥形，量得底面周长18.84米，高1.2米．若每立方米煤重1.4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 * 1.2</gadget>
<output>11.304</output>

<gadget id="calculator">11.304 * 1.4</gadget>
<output>15.8256</output>

<result>15.8256</result>