A rectangular cardboard with a length of 20 cm and a width of 12 cm is rotated 180 degrees around one of its symmetry axes. What is the maximum volume of the rotated part?
一块长方形硬纸板，长20厘米，宽12厘米，现绕着它的一条对称轴旋转180度，转过部分的体积最大是多少？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36 * 20</gadget>
<output>2_260.8</output>

<result>2_260.8</result>