Circles – Notes
Tangents to a Circle
A line that touches a circle at only one point is called a tangent to the circle.
The point where a tangent touches a circle is called its point of contact.
Only one tangent can be drawn at any given point on a circle.
The tangent at any point on a circle is perpendicular to the radius drawn to its point of contact.
Only two tangents can be drawn to a circle from any point lying outside it.
Tangents drawn to the circle from an external point are equal in length.