The area of a square land calculated on a drawing is 4 square centimeters, and the actual area of this land is known to be 1600 square meters. what is the scale of this drawing
在一张图纸上计算出一块正方形地的面积是4平方厘米，已知这块地的实际面积是1600平方米．这张图纸的比例尺是多少
<gadget id="calculator">40 * 100</gadget>
<output>4_000</output>

<gadget id="calculator">2 / 4_000</gadget>
<output>1/2_000 = around 0.0005</output>

<result>1/2_000 = around 0.0005</result>