The circumference of a circle is 12.56 cm, what is its area in square centimeters?
圆周长是12.56厘米，它的面积是多少平方厘米？
<gadget id="calculator">12.56 / 2 / 3.14</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>