Angle between two intersecting curves (tan θ = |(m1 - m2)/(1 + m1*m2)|)
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tan θ = |(m1 - m2)/(1 + m1*m2)|
What each symbol means
| Symbol | What it stands for |
|---|---|
| θ | Acute angle between tangents |
| m_1 | Slope of first curve at intersection |
| m_2 | Slope of second |
When to use this
Curves intersect at point; 1 + m1m2 ≠ 0 (not perpendicular case for tan formula — if perpendicular, θ = π/2). Use acute angle via absolute value.