A rectangular iron sheet with a length of 31.4 cm and a width of 18.84 cm should be matched with a circular iron sheet with a diameter of several centimeters to make a container with the largest volume. (not counting joints)
用一张长31.4厘米、宽18.84厘米的长方形铁皮，应配上直径多少厘米的圆形铁皮，才能做成一个容积最大的容器．(接头处不计)
<gadget id="calculator">31.4 / 3.14</gadget>
<output>10</output>

<result>10</result>