On the drawing with a scale of 1:2000, the side length of a square flower bed is measured to be 4 cm. What is the actual area of the flower bed?
在比例尺是1：2000的图纸上，量得一个正方形花坛的边长为4厘米，这个花坛实际面积是多少？
<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">4 / (1/2_000) / 100</gadget>
<output>80</output>

<gadget id="calculator">80 * 80</gadget>
<output>6_400</output>

<result>6_400</result>