On a 1:800 drawing, the area of a square vegetable field is 10 square centimeters. What is the actual area of this vegetable field in square meters?
在一幅1：800的图纸上，一块正方形的菜地的面积是10平方厘米，这块菜地的实际面积是多少平方米．
<gadget id="calculator">6_400_000 / 10_000</gadget>
<output>640</output>

<result>640</result>