Curated Video
Classifying Triangles Based On Angle Properties
Classifying triangles based on angle properties.
Curated OER
What are Acute, Obtuse, and Right Triangles?
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...
Virtual Nerd
Virtual Nerd: How Do You Classify Triangles?
If you know what kind of triangle you're looking at, it's much easier to figure out how to solve for various sides and angles. Use this tutorial to practice classifying triangles. [7:15]
CK-12 Foundation
Ck 12: Elem Math: Overview of Special Triangles
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on how to find missing angles in triangles.
CK-12 Foundation
Ck 12: Elem Math: Overview of Triangle Classifications
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on how to classify triangles.
Sophia Learning
Sophia: Classifying Triangles
In this video tutorial, students learn how to classify triangles based on the angles. Topics include right, obtuse, and acute triangles. A short assessment is included to follow the lesson. [4:40]
Art of Problem Solving
Art of Problem Solving: Area of an Acute Triangle
Video tutorial uses examples to reinforce understanding of how to find the area of an acute triangle. [8:21]
Sophia Learning
Sophia: Triangle Height: Lesson 3
This lesson will demonstrate how to locate the height in an obtuse, right, and acute triangle. It is 3 of 5 in the series titled "Triangle Height."