On a map with a scale of 1:50000, the side length of a square experimental base is 1.2 cm. What is the actual circumference of the base in kilometers?
在比例尺为1：50000的地图上，量得一正方形的实验基地边长是1.2cm，实际上这个基地的周长是多少千米
<gadget id="calculator">1 / 50_000</gadget>
<output>1/50_000 = around 0.00002</output>

<gadget id="calculator">1.2 / (1/50_000) / 100_000</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 * 4</gadget>
<output>2.4</output>

<result>2.4</result>