Corbett Maths
Hexagon Inscribed Within a Circle
Mark off the length of the radius around the circle. Using a compass, the presenter shows how to construct a regular hexagon in a circle. Pupils see how triangles formed in the hexagon are equilateral, allowing for the construction to...
Corbett Maths
Constructing Equilateral Triangles and 60 Degree Angles
Creating a 60-degree angle also creates an equilateral triangle. By watching the video, individuals learn the steps required to construct a 60-degree angle. The presentation shows that the process is the same for constructing an...
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."
Virtual Nerd
Virtual Nerd: Construct Equilateral Triangle and Square Inscribed in a Circle
Two videos on geometric constructions. One explains how to construct an equilateral triangle using a ruler and compass. The second describes how to draw a square using a compass and a straightedge.
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."
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]
Virtual Nerd
Virtual Nerd: Why Are the Angles of Equilateral Triangles Always Equal to 60 Degrees?
In this tutorial, learn how to find the measurements of the interior angles of an equilateral triangle. [5:02]
Virtual Nerd
Virtual Nerd: What Is a Polygon?
This tutorial explains the properties of a polygon, the names of the most popular polygons, and teaches how to identify polygons. [5:41]
Khan Academy
Khan Academy: Triangles: Equilateral Triangle Sides and Angles Congruent
A video showing that all of the angles of an equilateral triangle are 60 degrees. The proof is written as a two-column proof.
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]
Khan Academy
Khan Academy: Special Right Triangles: Area of a Regular Hexagon
This video demonstrates how to determine the area a regular hexagon using what we know about triangles.
Khan Academy
Khan Academy: Triangles: Area of an Equilateral Triangle
This video tutorial explores finding the formula for the area of an equilateral triangle with side length of s.
Khan Academy
Khan Academy: Triangles: Area of Inscribed Equilateral Triangle
Students explore a problem that requires then to figure out the area of an equilateral triangle inscribed in a circle using a little trigonometry.
Sophia Learning
Sophia: Using Triangles to Examine Quadrilaterals
This lesson demonstrates how to determine properties of quadrilaterals by using triangles.
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."
Sophia Learning
Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 3
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 3 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."
Sophia Learning
Sophia: Equilateral Triangles: Lesson 5
This lesson will prepare you to distinguish an equilateral triangle based on the sides of a triangle. It is 5 of 8 in the series titled "Equilateral Triangles."
Sophia Learning
Sophia: Equilateral Triangles
This lesson will prepare you to distinguish an equilateral triangle based on the sides of a triangle.