A conical coal pile has a base radius of 4 meters and a height of 1.8 meters. If each cubic meter of coal weighs 1.5 tons, how many tons does this pile of coal weigh?
一个圆锥形煤堆，底面半径是4米，高1.8米．如果每立方米煤重1.5吨，这堆煤重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 1.8</gadget>
<output>30.144</output>

<gadget id="calculator">30.144 * 1.5</gadget>
<output>45.216</output>

<result>45.216</result>