Instructional Video

Special Right Triangle 45-45-90: Lesson

This Special Right Triangle 45-45-90: Lesson instructional video also includes:

Square roots connect squares and right triangles. Using the Pythagorean Theorem, the video shows the relationship between the sides and hypotenuse of a 45-45 right triangle. The portion of a larger geometry playlist applies the relationship to find the lengths associated with a square.

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Instructional Ideas
  • Lead a discussion on whether a length of an isosceles right triangle will be a multiple of the square root of two
  • Create a graphic organizer on how to find the sides given the hypotenuse or the hypotenuse given the sides
Classroom Considerations
  • Assumes individuals are comfortable working with radicals
  • This video is hosted on YouTube
  • Links to more resources dealing with 45-45 right triangles
  • Shows the arithmetic to solve the examples
  • None