If a cylindrical object with a base diameter of 4 decimeters and a height of 3 decimeters is processed into the largest conical object, what is the volume of the cone?
把一个底面直径是4分米，高是3分米的圆柱形物体加工成一个最大的圆锥形物体，这个圆锥的体积是多少．
<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>