A conical coal pile with a base diameter of 4 meters and a height of 18 decimeters. If each cubic meter of coal weighs 1.35 tons, how many tons does this pile of coal weigh?
一个圆锥形煤堆，底面直径是4米，高18分米．如果每立方米煤重1.35吨，这堆煤大约重多少吨？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">18 / 10</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(9/5) / 3</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3.14 * 4 * (3/5) * 1.35</gadget>
<output>10.1736</output>

<result>10.1736</result>