Roll a rectangular piece of paper with a length of 6.28 decimeters and a width of 3.14 decimeters into a cylinder, and stand the cylinder upright on a table. What is its maximum volume?
把一张长6.28分米，宽3.14分米的长方形纸片卷成一个圆柱，并把圆柱直立在桌子上，它的最大容积是多少．
<gadget id="calculator">6.28 / 2 / 3.14</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 3.14</gadget>
<output>9.8596</output>

<result>9.8596</result>