A conical sand pile has a base circumference of 18.84 square meters and a height of 2 meters. If each cubic meter of sand weighs 2 tons, how many tons does the pile of sand weigh?
一个圆锥形的沙堆，底面周长是18.84平方米，高是2米．如果每立方米的沙重2吨，这堆沙重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<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) * 3.14 * 9 * 2 * 2</gadget>
<output>37.68</output>

<result>37.68</result>