If the length of the classroom in this class is measured to be 4.5 cm on a plan with a scale of (1/200), what is the actual length of the classroom in this class in meters?
若在比例尺是(1/200)的平面图上，量得本班教室的长是4.5厘米，本班教室的实际长是多少米．
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">4.5 / (1/200)</gadget>
<output>900</output>

<gadget id="calculator">900 / 100</gadget>
<output>9</output>

<result>9</result>