If a square lawn with a side length of 4 cm is drawn on a drawing with a scale of 1:5000, what is the actual area of the lawn in square meters?
如果在比例尺是1：5000的图纸上，画一个边长为4厘米的正方形草坪图，这个草坪图的实际面积是多少平方米．
<gadget id="calculator">200 * 200</gadget>
<output>40_000</output>

<result>40_000</result>