A pile of conical sand has a circumference of 31.4 meters at the bottom and a height of 1.5 meters. Each cubic meter of yellow sand weighs 2 tons. How many tons does this pile of yellow sand weigh?
一堆圆锥形沙堆，底面周长是31.4米；高是1.5米，每立方米黄沙重2吨，这堆黄沙重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">31.4 / 6.28</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 1.5 * 2</gadget>
<output>78.5</output>

<result>78.5</result>