A conical sand pile has a bottom diameter of 50 decimeters, a height of 1.8 meters, and a sand weight of 1.7 tons per cubic meter. How heavy is this pile of sand?
一个圆锥形沙堆，底面直径是50分米，高1.8米，每立方米沙重1.7吨，这堆沙有多重？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">(1/3) * 3.14 * (25/4) * 1.8 * 1.7</gadget>
<output>20.0175</output>

<result>20.0175</result>