1. Equation of a pair of lines passing through the origin
2.Angle between pair of lines
3.Bisectors of the angles between two lines.
4. pair of bisectors of angles between the pair of lines.
5.Equation of pair of lines passing through given point and parallel/perpendicular to the given pair of lines.
6.Condition for perpendicular and coincident lines
7. Area of the triangle formed by give pair of lines and a line.
8.pair of lines-second degree general equation
9. Conditions for parallel lines-distance between them.
10. Point of intersection of the pair of lines.
11.Homogenising a second degree equation w.r.t a 1st degree equation in x and y.
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