A conical sand pile has a base radius of 5 meters and a height of 1.8 meters. What is the volume of the sand pile in cubic meters?
一个圆锥形沙堆，底面半径为5米，高1.8米，这个沙堆的体积是多少立方米．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 25 * 1.8 * (1/3)</gadget>
<output>47.1</output>

<result>47.1</result>