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Summary

1. The common point of the tangent and the circle is called the point of contact.

2. A tangent to a circle is perpendicular to the radius through the point of contact.

3. A tangent to a circle is a special case of the secant, when both the end points of the corresponding chord coincide.

4. Only one tangent can be drawn through a point on a circle.

5. No tangent can be drawn through a point lying inside the circle.

6. Two tangents can be drawn through a point lying outside the circle.

7. The lengths of the two tangents from a point (external) to a circle are equal.




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