Circle

Tangent and Normal to Circle

Tangent to a circle

A tangent to a curve at a point is the limiting position of a line joining two points on the curve in the neighbourhood of the given point (at which tangent has to be drawn), as both the points tend to the given point.

Let P and Q be two points on a circle. Then the position to which the line PQ tends as Q moves closer to the point P, i.e the limiting position of chord PQ as Q tends to P along the circle, is called the tangent to the circle at point P. The point P is called the point …