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The circle shown has center O, and arc EPF is a semicircle. Quadrilateral EAOD, ABCD, and OBFC are squares, and the length of each side of ABCD is 1. What is the perimeter of region EPFCD?
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· 相关考点
4.5.3 弧长与扇形面积
4.5.3 弧长与扇形面积
以上解析由 考满分老师提供。