题目内容
若直线经过A(-2
,9)、B(6
,-15)两点,则直线AB的倾斜角是( )
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A.45° | B.60° | C.120° | D.135° |
C
试题分析:设直线AB的倾斜角是θ,由直线的斜率公式得 k="tan" θ=
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又 0≤θ<π,θ=120°,故选 C.
点评:本题考查直线的倾斜角和斜率的关系,以及倾斜角的取值范围,已知三角函数值求角的大小.求出斜率tanθ是解题的关键
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