The distance between the two feet of the compass is 1cm, what is the area in cm**2.
圆规两脚之间的距离是1cm，面积是多少cm**2．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>