A cone has a height of 30 cm and a base radius of 10 cm, what is its volume in cubic centimeters?
一个圆锥，它的高是30厘米，底面半径是10厘米，它的体积是多少立方厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">(1/3) * 3.14 * 100 * 30</gadget>
<output>3_140</output>

<result>3_140</result>