There is a circular musical fountain in People's Square, its diameter is 4 meters, what is the area of the garden in this community in square meters?
人民广场有一个圆形的音乐喷泉，它的直径是4米，则这个小区的花园的面积是多少平方米？
<gadget id="calculator">4 / 2</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>