Master Zhang wants to cut a cylindrical wood into a cone. The diameter of the bottom of the wood is 4 decimeters and the height is 3 decimeters. What is the volume of the largest cone that can be cut?
张师傅要把一根圆柱形木料削成一个圆锥，木料的底面直径是4分米，高是3分米，削成的最大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 * 3</gadget>
<output>12.56</output>

<result>12.56</result>