Formula of tan wth respect to two slopes
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Correct formula with sign convention positive for θθ counter-clockwise rotation from direction of radius vector 11 to 22 is
tan(θ)=m2−m11+m1m2.
tan(θ)=m2−m11+m1m2.
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formula:
tan θ = |m2 − m11 + m1 m2| , where m1 and m2 are the slopes of the line AB and CD respectively.
If m2 − m11 + m1 m2is positive then the angle between the lines is acute. If m2 − m11 + m1 m2 is negative then the angle between the lines is obtuse.
tan θ = |m2 − m11 + m1 m2| , where m1 and m2 are the slopes of the line AB and CD respectively.
If m2 − m11 + m1 m2is positive then the angle between the lines is acute. If m2 − m11 + m1 m2 is negative then the angle between the lines is obtuse.
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