On a drawing with a scale of 1:4000, draw a square lawn with a side length of 6 cm. What is the actual area of the lawn in square meters?
在比例尺是1：4000的图纸上，画一个边长是6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">240 * 240</gadget>
<output>57_600</output>

<result>57_600</result>