To cut a circular piece of paper with an area of 28.26 square centimeters, you need at least a square piece of paper with a side length of how many centimeters.
要剪一个面积28.26平方厘米的圆形纸片，至少需要边长是多少厘米的正方形纸片．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>