Can any three lengths make a triangle? One of the videos in a playlist on basic geometry introduces the Triangle Inequality Theorem. Using three given lengths, the presentation illustrates the restrictions on lengths of any side of a triangle in relationship to the other two.

Concepts

triangles, triangles inequalities, triangle properties, inequalities

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Additional Tags

math

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Instructional Ideas

• Provide class members lengths of straws to determine whether they can form a triangle
• Lead a discussion on how to simplify the inequalities to check by choosing the longest side

Classroom Considerations

• Individuals should understand inequalities

• This video is hosted on YouTube

Pros

• Contains links to other CK-12 resources dealing with the Triangle Inequality Theorem
• Shows different types of problems using the theorem

Cons

• None

Common Core

7.G.A.2 MP7