👉 Tangency is a mathematical concept that refers to the line of intersection between two parallel lines. It is also known as the perpendicular bisector or perpendicular distance from a point to a line. In geometry, it is used in various situations where two lines are intersected by another line. For example, if you have a set of points (A, B, C, D) that lie on two lines L1 and L2, and you want to find the shortest path between A and B