Instructional Video

Special Right Triangles I

Curated and Reviewed by Lesson Planet

Introduce a special relationship with right triangles. Learners discover the ratio of the sides in a 30-60-90 triangle. After watching several examples and seeing two different methods, pupils find unknown sides in triangles. Scholars continue to work problems to practice finding lengths related to 30-60-90 triangles.

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Instructional Ideas
  • Create a graphic organizer with a picture of a 30-60-90 triangle to show the operations necessary to move from one known length to the others
Classroom Considerations
  • Assumes the class understands how to simplify radicals
  • Second lesson in a six-part unit exploring right triangles
  • Find the video clips referred to in the presentation, as they do not play
  • This video is hosted on YouTube
Pros
  • Provides information on where to get additional support on simplifying radicals
  • Includes an additional worksheet to provide extra practice if needed
Cons
  • None