A grain pile is conical, 1.5 meters high, and the length of a circle around the bottom of the grain pile is 31.4 meters. If each cubic meter of grain weighs 0.5 tons, how many tons does this pile of grain weigh?
一个粮堆呈圆锥形，高1.5米，沿粮堆底面绕一圈的长是31.4米．如果每立方米粮食重0.5吨，那么这堆粮食重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">(1/3) * 3.14 * 25 * 1.5</gadget>
<output>39.25</output>

<gadget id="calculator">39.25 * 0.5</gadget>
<output>19.625</output>

<result>19.625</result>