A rectangular mat, 62.8 decimeters long and 31.4 decimeters wide, is rolled into a cylindrical granary to store rice (joints are not counted). What is its maximum volume?
一张长方形席子，长62.8分米，宽31.4分米，把它卷成一个圆柱体粮仓存放稻谷(接头处不计)．它的容积最大是多少？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">62.8 / 6.28</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 31.4</gadget>
<output>9_859.6</output>

<result>9_859.6</result>