To cut a circular iron sheet with an area of 50.24 square centimeters, at least how many square centimeters of square iron sheet is needed.
要剪一个面积是50.24平方厘米的圆形铁皮，至少需要多少平方厘米的正方形铁片．
<gadget id="calculator">50.24 / 3.14</gadget>
<output>16</output>

<gadget id="calculator">4 * 16</gadget>
<output>64</output>

<result>64</result>