CHAPTER+9.2+T.O.

9.2 TANGENTS TO CIRCLES
1. Define tangents and secants of circles. 2. Understand the relationship between tangents and cerain radii of circles. 3. Understand the geometry of a radius perpendicular to a chord of a circle.
 * __OBJECTIVES:__**


 * __BLUE BOXES AND DEFINITIONS:__

SECANTS AND TANGENTS-** a secant to a circle is a line that intersects the circle at two points. A tangent is a line in the plane of the circle that intersects the circle at exactly one point, which is known as the point of tangency.
 * TANGENT THEOREM-** If a line is tangent to a circle, then the line is congruent to a radius of the circle drawn to the point of tangency.
 * RADIUS AND CHORD THEOREM-** A radius that is perpendicular to a chord of a circle is hald the chord.
 * CONVERSE OF THE TANGENT THEOREM-** If a line is perpendicular to a radius of a circle at ists endpoint on the circle, then the line is congruent to the circle
 * THEORM-** The perpendicular besector of a chord passes throught the center of the circle.

the answer is rc because it is opposite to re. look at the theorems!
 * __EXAMPLE: