In the math class, Xiaoli cut a circular piece of paper with an area of 28.26cm**2. She should at least prepare a square piece of paper with a side length of how many centimeters.
数学课上，小丽剪了一个面积是28.26cm**2的圆形纸片，她至少要准备边长是多少cm的正方形纸片．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>