There is a circular fish pond with a perimeter of 31.4 meters. Now the boss wants to expand the fish pond to increase its diameter by 2 meters. How many square meters will the area of the fish pond increase?
有一个圆形的养鱼池周长是31.4米，现在老板要要扩大鱼池将它的直径增加2米，这个鱼池的面积将增加多少平方米？
<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>