To cut a circular iron sheet with an area of 28.26 square centimeters, at least how many square centimeters of square iron sheets are needed.
要剪一个面积28.26平方厘米的圆形铁片，至少需要多少平方厘米的正方形铁皮．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>