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

Tangent and Secant of a Circle

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