Khan Academy
Khan Academy: Special Right Triangles Intro (Part 1)
Introduction to 45-45-90 triangles.
Sophia Learning
Sophia: Two Special Triangles: Lesson 3
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."
Sophia Learning
Sophia: Two Special Triangles: Lesson 2
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."