Touch a circle once. Individuals watch a video and learn two theorems related to tangents and circles. The pupils then apply the theorems to find missing angle measures and lengths in figures. At the end, they practice their skills on their way to mastery.

Concepts

tangent, tangent lines, radius, circles

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Instructional Ideas

• Provide a short review of the sum of angles in different figures

Classroom Considerations

• Assumes the class knows how to apply the Pythagorean Theorem
• First lesson in a series of five covering circles

• This video is hosted on YouTube

Pros

• Asks the viewers to pause the video and work on an example before providing the solution
• Includes detailed answer keys

Cons

• None

Common Core

SL.9-10.2 SL.11-12.2 MP6 MP7 HSG-C.A.2