Draw the largest circle on a square cardboard. The circumference of the known circle is 37.68 cm. What is the area of this square cardboard?
在一个正方形纸板上画了一个最大的圆，已知圆的周长是37.68厘米，这张正方形纸板的面积是多少？
<gadget id="calculator">37.68 / 3.14</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>