The measures all add up. The presentation, part of a helpful playlist on geometry, provides the statement of the Triangle Sum Theorem. Using the theorem, the video shows how to find the missing measure of an angle.

Concepts

triangle sum theorem, triangles, triangle properties, angle measurement, angles, interior angles

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Additional Tags

math

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Instructional Ideas

• Develop a proof of the Triangle Sum Theorem

Classroom Considerations

• Individuals should know how to solve linear equations
• The class should be familiar with different types of triangles

• This video is hosted on YouTube

Pros

• Works a variety of problems using the Triangle Sum Theorem
• Links to other CK-12 resources on finding the angle of a triangle

Cons

• None

Common Core

8.G.A.5 HSG-CO.C.9 MP3 MP6