A rectangular iron sheet with a length of 25.12 cm and a width of 18.84 cm can be used to make a cylindrical container.
用一块长25.12厘米，宽18.84厘米的长方形铁皮，配上、下面多少圆形铁片，正好可以做成圆柱形容器．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<result>4</result>