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.