The circumference of a circle is 37.68 cm, find the area of the circle.
一个圆的周长是37.68厘米，求圆的面积．
<gadget id="calculator">37.68 / 3.14</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>