Draw a rectangular piece of land on paper with a scale of 1:200. The circumference on the picture is 18 cm, and the ratio of length to width is 5:4. What is the actual area of the land in square meters?
把一块长方形土地，用1：200的比例尺画在纸上，图上的周长是18厘米，长与宽的比是5：4，这块地的实际面积是多少平方米？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<result>80</result>