What is the volume of a conical container with a bottom diameter of 4 decimeters and a height of 9 decimeters?
底面内直径是4分米，高9分米的圆锥容器的容积是多少升．
<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>