如图，AB是⊙O的直径，CD是⊙O的一条弦，且CD⊥AB于点E，CD=4 2 ，AE=2，则⊙O的半径为_1．_刷题宝

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如图，AB是⊙O的直径，CD是⊙O的一条弦，且CD⊥AB于点E，CD=4 2 ，AE=2，则⊙O的半径为____．

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