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. 

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