I started the chapter on circle by introducing the concept of tangent to a circle.

A tangent to a circle has two defining properties

* A tangent touches a circle in exactly one point. This point is called point of tangency.

* The tangent intersects the circle's radius at a 90° angle

Watch Video on Tangent Line

Properties of two tangents to a circle

If two tangents lines are drawn namely AP and BP, they will intersect at a point, P. The properties of the two tangent lines are listed below :

1. CA = CB

2. AP = BP

3. Angle ACP = Angle BCP

4. Angle Angle APC = Angle BPC

5. Angle CAP and angle CBP are both right angles

6. Triangle CAP and BCP are congruent

## Monday, September 14, 2009

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