On a drawing with a scale of 1:200, the diameter of a circular flower bed is measured to be 4 cm. How many square meters does this circular flower bed actually occupy?
在一幅比例尺是1：200的图纸上，量得一个圆形花坛的直径是4厘米，求这个圆形花坛实际占地多少平方米？
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">4 / (1/200) / 100 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>