Derive the Pythagorean Identity Using Similar Triangles

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There are a number of ways to prove the Pythagorean Identity, sin2θ + cos2θ = 1. After a concise review of the definition of similar triangles, the video walks through a demonstration of the proof. This short presentation could be used as a review or as an introduction to the topic. 

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CCSS: Designed
Classroom Considerations

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Pros

  • Provides a good review of important concepts of similar triangles at the beginning of the video
  • Straightforward explanation
  • Clear, uncluttered graphics help reinforce student understanding
Cons

  • None
Common Core