The diameter of a circular flower bed is 6 meters, and the square part with a side length of 2 meters in the middle is placed with flower pots, and the rest is planted with turf. How many square meters is the area for planting turf?
一个圆形花坛的直径是6米，中间边长为2米的正方形部分摆花盆，其余部分种植草皮，种草皮的面积是多少平方米？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">28.26 - 4</gadget>
<output>24.26</output>

<result>24.26</result>