A cone has a base diameter of 4 decimeters and a height of 9 decimeters, what is its volume in cubic decimeters?
一个圆锥的底面直径是4分米，高是9分米，它的体积是多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 9</gadget>
<output>37.68</output>

<result>37.68</result>