Circle Theorems involving Angle Measures, Inscribed Angles, Intersecting Chords, Secants & Tangents

Learn how to find various angles when working with circles in this free math video tutorial by Mario's Math Tutoring. We discuss central angles, inscribed angles, angles formed by intersecting chords, and angles formed by secants and tangents to a circle.

0:20 Formula for Finding the Measure of the Arc Given Central Angle
0:49 Formula for 2 Intersecting Chords Not at the Center
1:28 Formula for Inscribed Angles Where Vertex is On the Circle
2:01 Formula for 2 Secants or 2 Tangents or a Secant and a Tangent
2:31 How to Remember the Equations Depending on Where the Vertex is Located
3:18 Example 1 Finding Central Angle
3:36 Example 2 Finding Angle Formed by 2 Chords
3:56 Example 3 Finding Angle Formed by 2 Chords
4:30 Example 4 Finding the Inscribed Angle
4:42 Example 5 Finding Angle Formed by Tangent and Chord
4:56 Example 6 Finding Exterior Angle Formed by 2 Secants
5:08 Example 7 Finding Exterior Angle Formed by 2 Tangents

Related Videos:

Segment Length Formulas in Circles
   • Circle Theorems involving Secants, Ch...  

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