After a square flower bed with a side length of 3 meters is built in the middle of a circular lawn with a radius of 5 meters, how many square meters of grass are left?
在一块半径是5米的圆形草地的中间修一个边长为3米的正方形花坛后，草地面积还剩下多少平方米？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">25 * 3.14</gadget>
<output>78.5</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">78.5 - 9</gadget>
<output>69.5</output>

<result>69.5</result>