NUMBEROCK
Triangles
Skateboards, mountain climbing, billiards' Don't you just love this stuff? That's why NUMBEROCK put it all into this song about triangles that is filled with real-world connections. Triangles are all around us, so it is easy to make this...
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...
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 Obtuse Triangle
Video tutorial uses examples to reinforce understanding of how to find the area of an obtuse triangle. [6:44]
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."