Angle between two lines (slopes) (Acute angle θ between two lines with slopes m1,m2 (when product ≠ −1).)
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Acute angle θ between two lines with slopes m1,m2 (when product ≠ −1).
What each symbol means
| Symbol | What it stands for |
|---|---|
| θ | Acute angle between them |
| m1,m2 | Slopes of the two lines |
When to use this
If m1m2=−1, lines perpendicular; formula blows up → θ=90°.