Instructional Video
Khan Academy

Khan Academy: Special Right Triangles Intro (Part 1)

9th - 10th Standards
Introduction to 45-45-90 triangles.
Instructional Video
Sophia Learning

Sophia: Two Special Triangles: Lesson 3

9th - 10th
This lesson explains what 45-45-90 and 30-60-90 right triangles are and discusses their properties. It is 3 of 5 in the series titled "Two Special Triangles."
Instructional Video
Sophia Learning

Sophia: Two Special Triangles: Lesson 2

9th - 10th Standards
This lesson explains what 45-45-90 and 30-60-90 right triangles are and discusses their properties. It is 2 of 5 in the series titled "Two Special Triangles."