The diameter of a round calligraphy work is 6 decimeters, and it is decorated with a circle of lace around it. How many decimeters is the length of the lace?
一幅圆形书法作品的直径是6分米，沿它的四周装饰一周花边，花边的长度是多少分米？
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<result>18.84</result>