题目内容
若直线经过A(1,0),B(2,
)两点,则直线AB的倾斜角为( )
3 |
A.30° | B.45° | C.60° | D.120° |
∵直线经过A(1,0),B(2,
)两点,
∴直线AB的斜率k=
=
,
设直线的倾斜角为α,∴tanα=
,
∵α∈[0,π),α≠
,∴α=60°
∴直线AB的倾斜角α=60°.
故选:C.
3 |
∴直线AB的斜率k=
| ||
2-1 |
3 |
设直线的倾斜角为α,∴tanα=
3 |
∵α∈[0,π),α≠
π |
2 |
∴直线AB的倾斜角α=60°.
故选:C.
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