The lawn of the square is a rectangle drawn on the design drawing with a scale of 1:4000. It is 4.5cm long and 2cm wide. How many square meters does the lawn actually occupy?
广场的草坪是一个长方形，用1：4000的比例尺画在设计图上，长4.5cm，宽2cm，求草坪实际占地面积是多少平方米？
<gadget id="calculator">1 / 4_000</gadget>
<output>1/4_000 = around 0.00025</output>

<gadget id="calculator">4.5 / (1/4_000) / 100</gadget>
<output>180</output>

<gadget id="calculator">2 / (1/4_000) / 100</gadget>
<output>80</output>

<gadget id="calculator">180 * 80</gadget>
<output>14_400</output>

<result>14_400</result>