On a 1:300 plan, the radius of the circular flower bed is 10 cm. What is the actual circumference of the flower bed in meters?
在一幅1：300的平面图上，量得圆形花坛的半径是10厘米，花坛的实际周长是多少米．
<gadget id="calculator">1 / 300</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">10 / (1/300) / 100</gadget>
<output>30</output>

<gadget id="calculator">3.14 * 30 * 2</gadget>
<output>188.4</output>

<result>188.4</result>