Tiananmen Square is the largest square in the world, covering an area of about 40 hectares. If you draw it on a drawing with a scale of 1:200,000, what is the area in square centimeters?
天安门广场是世界最大的广场，占地面积约40公顷，把它画在比例尺是1：200000的图纸上，图上面积是多少平方厘米．
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">40 * 100_000_000 * (1/200_000) * (1/200_000)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>