Use a piece of rectangular paper with a length of 9.42 cm and a width of 3.14 cm to form a cylindrical paper tube. What is the maximum volume of the enclosed cylinder?
用一张长9.42厘米，宽3.14厘米的长方形纸，围成一个圆柱形纸筒，围成的圆柱体积最大是多少．
<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25 * 3.14</gadget>
<output>22.1841</output>

<result>22.1841</result>