The circumference of a circular flower bed is 9.42 meters, and there is a railing around 1 meter outside the flower bed, what is the length of the railing in meters?
一个圆形花坛的周长为9.42米，在花坛外围1米处围上一圈栏杆，则栏杆的长为多少米．
<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 + 1</gadget>
<output>2.5</output>

<gadget id="calculator">3.14 * 2.5 * 2</gadget>
<output>15.7</output>

<result>15.7</result>