Sew a piece of lace to a circular tablecloth with a diameter of 2m. The length of the joint is 10m. How many meters is the length of the lace?
给直径2m的圆形桌布缝一条花边，接头处长10m，花边长多少米？
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 + 10</gadget>
<output>16.28</output>

<result>16.28</result>