CIRCLES | SECANT AND TANGENT, SOME PROPERTIES OF TANGENT TO A CIRCLE, TANGENT FROM A POINT ON A CIRCLE, LENGTH OF THE TANGENT | Definition of circle, Theorem: A tangent to a circle is perpendicular to the radius through the point of contact., Theorem:A line drawn through the end point of a radius and perpendicular to it is a tangent to the circle., Position of point and Find the no of tangents, Theorem: The length of two tangents drawn from an external point to a circle are equal., Theorem:If two tangents are drawn to a circle from an external point ; then (i) they subtend equal angles at the centre. (ii) they are equally inclined to the line segments ; joining the centre to that point.