A conical sand pile has a bottom circumference of 31.4 meters and a height of 3 meters. The sand weighs 1.7 tons per cubic meter. How many tons does this pile of sand weigh?
一个圆锥形沙堆，底面周长是31.4米，高是3米，每立方米沙重1.7吨，这堆沙重多少吨？
<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 * 3</gadget>
<output>78.5</output>

<gadget id="calculator">78.5 * 1.7</gadget>
<output>133.45</output>

<result>133.45</result>