题目内容
(本小题满分12分)
△ABC中,A(– 4,2).
(1)若∠ACB的平分线CD所在直线方程为,B(3,1),求点C的坐标;
(2)若两条中线所在直线分别为,求直线BC的方程.
△ABC中,A(– 4,2).
(1)若∠ACB的平分线CD所在直线方程为,B(3,1),求点C的坐标;
(2)若两条中线所在直线分别为,求直线BC的方程.
(1)C(2,4)
(2)
解:(1) 设C(m,2m),则
∵CB到CD的角等于CD到CA的角
∴
∴m = 2
∴C(2,4)··········································································· 6分
∴
∴
∴B(2,4),C(4,0)
∴BC方程为··································· 12分
∵CB到CD的角等于CD到CA的角
∴
∴m = 2
∴C(2,4)··········································································· 6分
∴
∴
∴B(2,4),C(4,0)
∴BC方程为··································· 12分
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