3．△ABC内接于⊙O,AB是直径,BC=4,AC=3,CD平分∠ACB,则弦AD长为
人气：314 ℃ 时间：2019-11-25 16:55:02
解答
Ab是直径角c为直角,ab=5.角acd =45度,且cd过o点,角cad=90度所以ad为ac的值3.CD不过O点，怎么写？同学，我错了，不得三。应由a向cd做垂于e，ae=二分之三倍根号二。b=d,ad=ae乘三分之五。对不起。。。。。。
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