Is it possible to take an equilateral triangle and cut it in half to make a 30-60-90 special triangle to make it easier to solve a problem? Why yes, of course! It's even possible to find the missing length without using the Pythagorean...

Use examples to solve for the angles of equilateral triangles in a PowerPoint presentation. Includes video. [4:18]

Explore scalene, isosceles, and equilateral triangles and how to determine which is which. Assess learning with a quiz.

This video lesson [2:10] shows examples for classifying triangles by their side lengths. Students can check their understanding with an assessment.

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....

A video proving that the given triangles are congruent by ASA.

This QuickTime movie provides an opportunity to identify Polyhedra using Nets. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.