已知如图正八边形a1a2a3a4a5a6a7a8内接于半径为r的⊙o.1求a1a3的长2求四边形a1a2a3o的面积3求此 Template




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tomski已知如图正八边形a1a2a3a4a5a6a7a8内接于半径为r的⊙o.1求a1a3的长2求四边形a1a2a3o的面积3求此 coloring