Curated Video
Types of Triangles
This video will explain the four types of triangles and their properties: right-angled, equilateral, isosceles and scalene triangles. Practice questions are at the end of the video.
Brian McLogan
What is an acute triangle
👉 Learn the essential definitions of triangles. A triangle is a polygon with three sides. Triangles are classified on the basis of their angles or on the basis of their side lengths. The classification of triangles on the bases of their...
Let's Tute
Heron's Formula for Calculating Areas of Triangles and Quadrilaterals
This video explains how to calculate the area of triangles using Heron's formula, which only requires the length of the sides. It also shows how Heron's formula can be used to calculate the area of any type of quadrilateral if all the...
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...
Let's Tute
Types of Triangles Based on angles and sides - Geometry
In this online video we will learn Types of Triangles based on angles and sides.
Massachusetts Institute of Technology
Mit: Blossoms: Are Random Triangles Acute or Obtuse?
An MIT mathematics professor examines the probability of a random triangle being either obtuse or acute in a video [32:44] on geometrical probability. Video is accompanied by a teacher's guide, transcript, and several links on linear...
Massachusetts Institute of Technology
Mit: Blossoms: The Broken Stick Experiment
An MIT engineering professor leads teachers and students through an activity in triangle formation and probability that requires a meter stick and other basic classroom materials. This video [33:08] is accompanied by a teacher's guide,...
Sophia Learning
Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 1
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 1 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."
Sophia Learning
Sophia: Scalene Triangles: Lesson 4
After this lesson, you'll be able to pinpoint a scalene triangle based on the fact that no sides or angles in a scalene triangle are congruent. It is 4 of 6 in the series titled "Scalene Triangles."
Sophia Learning
Sophia: Triangle Angle Combinations: Lesson 5
This lesson explains how you can have 3 acute angles, 1 obtuse and 2 acute angles or 1 right and 2 acute angles in a triangle. It is 5 of 7 in the series titled "Triangle Angle Combinations."
Khan Academy
Khan Academy: Classifying Triangles
Discusses the different types of triangles and their angles. [6:00]
Khan Academy
Khan Academy: Classifying Triangles by Angles
Explains how to classify a triangle just by knowing the angle sizes. [5:30]
Virtual Nerd
Virtual Nerd: What Is a Triangle?
This tutorial explains triangles and their different types. [5:58]
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]
Virtual Nerd
Virtual Nerd: What Are Acute, Obtuse, and Right Triangles?
Take a look at this tutorial and learn about some of the different kinds of triangles. [4:25]
Virtual Nerd
Virtual Nerd: What Are Equilateral, Isosceles, and Scalene Triangles?
Watch this tutorial to learn about some of the different kinds of triangles. [5:33]
CK-12 Foundation
Ck 12: Elem Math: Classifying Triangles Based on Equal Sides
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on how to classify triangles based on side length.
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.
Virtual Nerd
Virtual Nerd: How Do You Classify Triangles?
This tutorial provides practice in classifying triangles which is useful when figuring out how to solve for various sides and angles. [7:15]
Khan Academy
Khan Academy: Triangles: 45 45 90 Triangle Side Ratios
Showing the ratios of the sides of a 45-45-90 triangle in this short video.
Sophia Learning
Sophia: Categorizing Triangles With Congruency
In this video tutorial, triangles are classified as isosceles, equilateral, and scalene by the congruency of their sides. Assess learning with a quiz. [1:52]
Sophia Learning
Sophia: Classifying Triangles
This video lesson describes and provides examples of right, acute, and obtuse triangles. Students can check their understanding with an assessment. [2:24]
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]
Sophia Learning
Sophia: Classifying Triangles by Angle
This video lesson shows examples of classifying triangles by their angle measurements. Students can check their understanding with an assessment. [3:54]