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Instructional Video

45-45-90 Triangles

Curated and Reviewed by Lesson Planet

45-45-90 triangles are half a square, which gives them a special status! The instructor explains the relationship of the sides of the 45-45-90 triangle using the Pythagorean Theorem as a reference. 

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CCSS: Adaptable
Concepts
special right triangles, right triangles, pythagorean theorem
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Additional Tags
math
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Instructional Ideas
  • Pause the video at optimal points to ask and answer clarifying questions
  • Ask learners to record special patterns in their notes
Classroom Considerations
  • YouTube video requires Internet access to view
  • The 10th lesson in a 40-part series
  • This video is hosted on YouTube
Pros
  • Shows an example with an image and one without
  • Spends time explaining the importance of the 45-45-90 triangle and the pattern of the side lengths
Cons
  • Does not include real-life application incorporating special right triangles
Common Core
HSG-SRT.A.2