Geometrymedium · Past Paper
The acute angle between the lines with slopes m1 and m2 is given by tan(θ) = :
A|(m1 - m2) / (1 + m1*m2)|
B|(m1 + m2) / (1 - m1*m2)|
C|m1 - m2|
Dm1 * m2
✓ Correct Answer: A — |(m1 - m2) / (1 + m1*m2)|
This is the standard formula for the angle between two straight lines based on their slopes.
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