A conical pile of sand has a base radius of 2 meters and a height of 5.1 meters. What is the volume in cubic meters?
一个圆锥形的沙堆，底面半径是2米，高是5.1米．体积是多少立方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">(1/3) * 3.14 * 4 * 5.1</gadget>
<output>21.352</output>

<result>21.352</result>