To cut a circular piece of paper with an area of 12.56 square centimeters, you need at least a square piece of paper with an area of square centimeters (π takes 3.14).
要剪一个面积是12.56平方厘米的圆形纸片，至少需要面积是多少平方厘米的正方形纸片(π取3.14)．
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

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

<result>16</result>