A rectangular piece of land is 200 meters long and 120 meters wide. If you want to build a circular flower bed with the largest area in the center of the land, what is the area of the flower bed in square meters?
一块长方形的地，长为200米，宽为120米，要在这块地的中央修建一个面积最大的圆形花坛，那修建的花坛面积是多少平方米．
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 ** 2</gadget>
<output>3_600</output>

<gadget id="calculator">3.14 * 3_600</gadget>
<output>11_304</output>

<result>11_304</result>