In this lesson our instructor talks about secants, tangents, and angle measure. First, she discusses secant, tangent, and interior angles. Then she talks about secant and exterior angles. Four complete extra example videos round up this lesson.
Secant: A line that intersects a circle in exactly two points of a circle
If a secant and a tangent intersect at the point of tangency, then the measure of each angle formed is one-half the measure of its intercepted arc
If two secants intersect in the interior of a circle, then the measure of an angle formed is one-half the sum of the measures of the arcs intercepted by the angle and its vertical angle
If two secants, a secant and a tangent, or two tangents intersect in the exterior of a circle, then the measure of the angle formed is one-half the positive difference of the measures of the intercepted arcs
Secants, Tangents, & Angle Measures
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.