Drag the center of circle A and point C around to change the circle. [br]Drag the angle measure to change the angle at which line EC intersects [br]the radius AC. Answer the guiding questions as you explore lines tangent[br]to a circle.

1. What is the difference between a tangent line and a secant line?[br]2. What are the characteristics of the sketch when the line is a secant? [br] a. list the number of intersection points, the relationship to the radius, the angle measure etc. [br]3. What are the characteristics of the sketch when the line is a tangent?[br] a. list the number of intersection points, the relationship to the radis, the angle measure etc.[br]4. Write a conjecture about the angle between the tangent line and the radius of the circle?