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