Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn about...

Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: right, isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn...

Given an isosceles triangle, and the value of one angle, find the missing values. There are some special properties about isosceles triangles. Use the triangle sum theorem to solve this problem. Watch this video to see how the instructor...

Finding the missing values of two angles in an isosceles triangle is not as difficult as it sounds. But how can two out of three angle's measurements be found? Well, there are special properties about an isosceles triangle which make...

Isosceles triangles are explored in this video tutorial. The lesson models the parts of an isosceles triangle and describes how to find missing angle measures. [5:06]

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.

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

This QuickTime movie provides an opportunity to learn about the characteristics of the isosceles right triangles. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.