A pile of coal is piled up in a conical shape. The measured circumference of the bottom is 18.84 meters and the height is 3 meters. If the coal weighs 1.4 tons per cubic meter, how many tons does the pile of coal weigh?
一堆煤堆成圆锥形，测得底面周长是18.84米，高是3米，如果每立方米煤重1.4吨，这堆煤约重多少吨？
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 9 * 3 * (1/3) * 1.4</gadget>
<output>39.564</output>

<result>39.564</result>