题目内容
选修4-1:几何证明选讲
△ABC内接于⊙O,AB=AC,直线MN切⊙O于C,弦BD∥MN,AC、BD交于点E
(1)求证:△ABE≌△ACD
(2)AB=6,BC=4,求AE
△ABC内接于⊙O,AB=AC,直线MN切⊙O于C,弦BD∥MN,AC、BD交于点E
(1)求证:△ABE≌△ACD
(2)AB=6,BC=4,求AE
(1)略(2)AE=
(1)△ABE≌△ACD
(2)△ABC∽△BEC
∴
∴AE=
(2)△ABC∽△BEC
∴
∴AE=
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