Geometrymedium · Past Paper
The angle between the lines with slopes m1 and m2 is given by tan(theta) = :
A(m1 - m2) / (1 + m1m2)
B(m1 + m2) / (1 - m1m2)
Cm1m2
Dm1 - m2
✓ Correct Answer: A — (m1 - m2) / (1 + m1m2)
The standard formula for the angle between two lines uses the absolute value of (m1 - m2) / (1 + m1m2).
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