6.已知:如图,延长圆O的直径AB到点C,过点C做圆O的切线CE与圆O相切于点C,AE垂直于EC交圆O于点F,垂足为点E,连接AD.(1)若CD=2,CB=1,求圆O直径AB的长(2)求证:AD^2=AC*AF
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/27 02:43:26
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