After a rope is wound around a circle for 3 times, 12 meters remain. The radius of the circle is 12 meters. What is the length of the rope in meters?
有一根绳绕圆3圈后，余下12米，已知圆的半径为12米，绳子的长是多少米．
<gadget id="calculator">226.04 + 12</gadget>
<output>238.04</output>

<result>238.04</result>