The distance between the feet of the compass is 3 cm, what is the area of the circle drawn in square centimeters
圆规两脚间的距离是3厘米，画出圆的面积是多少平方厘米
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>