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英语翻译6.Point O is the center of both circles in the figure ab

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英语翻译
6.Point O is the center of both circles in the figure above.If the circumference of the large circle is 36 and the radius of the small circle is half of the radius of the large circle,what is the length of the darkened arc?
  (A) 10 (B) 8 (C) 6 (D) 4 (E) 2
英语翻译6.Point O is the center of both circles in the figure ab
只知道大小2圆形同一圆心点O,R大图半径,r小图半径,大图图周36 =2x3.1416xR.R=18/3.1416,
2r=R,没有图不清楚 darkened arc深色弧弧度是什麼!