Half of an equilateral triangle is a special right triangle. A video instructor shows how to find the pattern of the side lengths for a 30-60-90 triangle. She then applies the relationship to different examples.

Concepts

special right triangles, right triangles, pythagorean theorem

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Additional Tags

math

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Instructional Ideas

• Have learners record notes as they watch the video
• Post the video for absent pupils or those needing extra instruction

Classroom Considerations

• Content is a direct continuation of the previous lessons in the series

• This video is hosted on YouTube

Pros

• Spends time developing the pattern of sides lengths in the 30-60-90 triangle

Cons

• Instructor talks very quickly through the lesson 

Common Core

HSG-SRT.A.2