On a drawing with a scale of (1/200), the diameter of a semicircular flower bed is measured to be 2 cm. How many square decimeters does this flower bed actually occupy? (π takes 3.14)
在一幅比列尺是(1/200)的图纸上，量得一个半圆形花坛的直径是2厘米，这个花坛实际占地多少平方分米．(π取3.14)
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">1 / (1/200) / 10</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">3.14 * 200</gadget>
<output>628</output>

<result>628</result>