To cut out a circular piece of paper with an area of 12.56cm**2, at least how many square pieces of paper in cm**2 are needed.
要剪下一个面积为12.56cm**2的圆纸片，至少要多少cm**2的正方形纸片．
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

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

<result>16</result>