Scholastic
Study Jams! Classify Triangles
Jam on with this multi-faceted activity teaching triangle classification. Start with a learner-paced lesson describing the different qualities of triangles and follow with a fun karaoke session. Also provided are two types...
PBS
Proportional Scaling
It is not as simple as scaling. MIT researchers explain that a micro engine cannot just be a proportional scaling of a working larger engine. The Math at the Core: Ratios resource compares the proportions involved with the surface area...
PBS
Scale City — Scale Models in the Real World
Good things come in miniature packages. An interesting video from the Math at the Core MS: Ratios playlist introduces the collection of miniatures in the Kentucky Gateway Museum. Scholars use base-10 blocks to create scale models before...
PBS
Formulas for Circle Area and Circumference: Simple as Pie
Calculating circumference is as easy as pi times diameter. A short video explains how to measure pie tins using the diameter. It also describes the relationship between diameter and circumference. Using the knowledge, scholars consider...
CK-12 Foundation
Triangle Inequality Theorem: Lesson
Can any three lengths make a triangle? One of the videos in a playlist on basic geometry introduces the Triangle Inequality Theorem. Using three given lengths, the presentation illustrates the restrictions on lengths of any side of a...
TED-Ed
The Complex Geometry of Islamic Design
Discover the prevalence of geometric design in Islamic culture with this wonderful informational video. It begins with an overview of the complexity of designs dating back to the eighth century during early Islam, and then...
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: Equilateral Triangles: Lesson 2
This lesson will prepare you to distinguish an equilateral triangle based on the sides of a triangle. It is 2 of 8 in the series titled "Equilateral Triangles."
Sophia Learning
Sophia: Equilateral Triangles: Lesson 8
This lesson will prepare you to distinguish an equilateral triangle based on the sides of a triangle. It is 8 of 8 in the series titled "Equilateral Triangles."
Sophia Learning
Sophia: Equilateral Triangles: Lesson 4
This lesson will prepare you to distinguish an equilateral triangle based on the sides of a triangle. It is 4 of 8 in the series titled "Equilateral Triangles."
Math Mammoth
Math Mammoth: Drawing Triangles With Given Conditions
This video presents a number of problems where students would be asked to draw triangles that meet the given criteria. [8:48]
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: How Do You Find Missing Angles in an Isosceles Triangle?
Watch this tutorial to learn how identifying a triangle first can be helping in solving for a missing angle measurement. [4:29]
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]
Sophia Learning
Sophia: Properties of Equilateral Triangle and Takin' It 2 the Streets
Use examples to solve for the angles of equilateral triangles in a PowerPoint presentation. Includes video. [4:18]
Sophia Learning
Sophia: Area of a Triangle
This video tutorial shares several examples of different types of triangles as they are used to determine the area of each triangle. Assessment checks understanding. [6:54]
Virtual Nerd
Virtual Nerd: Find Missing Angles in an Isosceles Triangle Using Right Triangles
Discover how identifying your triangle first can be very helpful in solving for a missing interior angle measurement. [3:40]
Imagine Learning Classroom
Learn Zillion: Draw Triangles Using Given Angles
In this lesson, you will learn how to draw triangles by using given angles. [3:25]
Math Antics
Math Antics: Triangles
Gain a basic understanding of triangles by watching easy to understand video tutorial. Additional resources are available as part of a paid subscription service. [7:39]
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]
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]
Art of Problem Solving
Art of Problem Solving: Angles in a Triangle Part 2
Video tutorial uses problems to reinforce understanding of angles in a triangle. (Part 2) [6:23]
Sophia Learning
Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 2
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 2 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."