Lesson: Angles of Intersecting Lines in a Circle Mathematics • Third Year of Preparatory School

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In this lesson, we will learn how to find the measures of angles resulting from the intersection of two chords, two secants, two tangents, or tangents and secants in a circle.

Lesson Plan

Students will be able to

recall theorems for two or more intersecting chords,
recall and apply the theorems for two intersecting secants, an intersecting tangent and secant, and two intersecting tangents,
find unknown angle measures and lengths by applying these theorems,
solve problems which require the application of multiple theorems, including applied problems which require forming and solving equations.