Master Zhang wants to cut a cylinder with a base diameter of 4 decimeters and a height of 9 decimeters into the largest cone. What is the volume of this cone?
张师傅要把一个底面直径为4分米，高是9分米的圆柱体切成最大的圆锥，这个圆锥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>