The Pythagorean Theorem works for something other than right triangles; show your class all it can do. Using information from the Pythagorean Theorem, the video shows how to determine whether a triangle is an acute or obtuse triangle. Part of a large geometry playlist, the video uses the Pythagorean Theorem to find the distance between two points and introduces the distance formula.

Concepts

pythagoras, pythagorean theorem, acute triangles, obtuse triangles, distance, distance formula

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Additional Tags

math

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Instructional Ideas

• Conduct a mini-lesson to derive the distance formula from the Pythagorean Theorem
• Struggling learners may benefit from the reverse of the rule to classifying triangles by putting C squared first

Classroom Considerations

• Pupils should know the classifications of triangles

• This video is hosted on YouTube

Pros

• Links to more CK-12 Pythagorean Theorem application resources
• Provides worked examples

Cons

• The last summary of the rule to classify triangles is incorrect, square each quantity instead

Common Core

8.G.B.8 HSG-GPE.B.7 MP2 MP5