Instructional Video
Sophia Learning

Sophia: Properties of Equilateral Triangles

9th - 10th
Equilateral triangles are explored in this learning tutorial, which includes several videos [4:18; 4:18; 3:18] and a PowerPoint presentation. The lesson includes an introduction of equilateral triangles and their key characteristics....
Instructional Video
Khan Academy

Khan Academy: Triangles: Area of an Equilateral Triangle

9th - 10th Standards
This video tutorial explores finding the formula for the area of an equilateral triangle with side length of s.