Circles Lesson 4 April 30 09

The document contains information about the tangent theorem and tangent chord theorem. It provides definitions for each theorem and includes diagrams with unlabeled angles and segments to which the theorems can be applied to find measurements. Specifically, it states that a tangent is perpendicular to the radius at the point of tangency, tangent segments from an external point are congruent, and the angle between a tangent and chord equals the inscribed angle on the opposite side of the chord.