how to find angle between two lines
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When two lines intersect in a plane, their intersection forms two pairs of opposite angles called vertical angles.
If the two lines are not perpendicular and have slopes m1 and m2, then you can use the following formula to find the angle between the two lines.
The formula tan θ = ± m2−m11+m1m2 cannot be used to find the angle between the lines AB and CD, if AB or CD is parallel to y-axis.
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