On a drawing with a scale of 1:500, the diameter of the circular flower stand is 4cm. What is the actual floor area of the circular flower stand in m**2.
在一张比例尺为1：500的图纸上，量得圆形花台的直径是4cm，这个圆形花台的实际占地面积是多少m**2．
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">4 / (1/500) / 100 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>