cylinder with a length of 31.4 cm and a width of 10 cm is rolled into a cylinder. What is the maximum space occupied by the cylinder?
用一张长31.4厘米、宽10厘米的铁皮卷成一个圆柱，这个圆柱所占的最大空间是多少．
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 10</gadget>
<output>785</output>

<result>785</result>