如图,弧AB所在圆的半径为R,弧AB的长为π/3R,圆O’和OA,OB分别相切与点C、E,且与圆O内切与点D,求圆O'的周长
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![如图,弧AB所在圆的半径为R,弧AB的长为π/3R,圆O’和OA,OB分别相切与点C、E,且与圆O内切与点D,求圆O'的周长](/uploads/image/z/2504516-68-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%BC%A7AB%E6%89%80%E5%9C%A8%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BAR%2C%E5%BC%A7AB%E7%9A%84%E9%95%BF%E4%B8%BA%CF%80%2F3R%2C%E5%9C%86O%E2%80%99%E5%92%8COA%2COB%E5%88%86%E5%88%AB%E7%9B%B8%E5%88%87%E4%B8%8E%E7%82%B9C%E3%80%81E%2C%E4%B8%94%E4%B8%8E%E5%9C%86O%E5%86%85%E5%88%87%E4%B8%8E%E7%82%B9D%2C%E6%B1%82%E5%9C%86O%27%E7%9A%84%E5%91%A8%E9%95%BF)
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