题目内容：

如图在圆O中,AB,CD是两弦,且AB>CD,OE⊥AB于点E,OF⊥CD于点F.求证OE

优质解答

证明：∵OE⊥AB∴AE＝AB/2∴OE²＝OA²-AE²∵OF⊥CD∴CF＝CD/2∴OF²＝OC²-CF²∴OE²-OF²＝OA²-AE²-OC²+CF²＝CF²-AE²＝（CD/2）²-（AB/2）...