Lesson: Angles of Intersecting Lines in a Circle Mathematics • First Year of Secondary 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 and apply the theorems for an intersecting tangent and secant, two intersecting secants, and two intersecting tangents,
recall theorems for two or more intersecting chords, and intersecting chords and tangents, including where a radius meets a tangent,
find unknown angle measures and lengths by applying these theorems,
solve problems that require the application of multiple theorems, including applied problems that require the forming and solving of equations.