Virtual Nerd
Virtual Nerd: How Do You Determine if a Triangle Is a Right Triangle
In this video lesson a students learns how to determine if a triangle is a right triangle by using the Pythagorean Theorem.
Khan Academy
Khan Academy: Geometry: Intro to 30 60 90 Triangles
Solves an example problem in which the length of the hypotenuse is known and the length of a side must be determined. Explains the special relationship of the lengths of the sides of a 30-60-90 triangle using the Pythagorean theorem....
Math Planet
Math Planet: Geometry: Triangles
Discussion of triangles through the use of examples and a video lesson. [1:08]
Virtual Nerd
Virtual Nerd: What Are the Legs and Hypotenuse of a Right Triangle?
Features an intoduction to the names for the different parts of a right triangle. [2:13]
Khan Academy
Khan Academy: Triangles: Intro to 30 60 90 Triangles
Explains the special relationship of the lengths of the sides of a 30-60-90 triangle using the Pythagorean theorem.
Sophia Learning
Sophia: Special Right Triangles
Special right triangles are investigated in this video tutorial. The lesson provides background knowledge and two videos that show the relationships of the sides in special right triangles and practice problems to test students'...
Sophia Learning
Sophia: Special Right Triangles
Special right triangles are explored in this video tutorial. The lesson provides four videos that explain the side ratios for 45-45-90 and 30-60-90 triangles along with real-world examples involving each type of triangle.
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Hypotenuse in a 45 45 90 Triangle?
In this tutorial, see how to solve for a missing side length by using your knowledge of 45-45-90 triangles to find a scale factor and set up an equation to solve. [4:51]
Khan Academy
Khan Academy: Triangles: Pythagorean Theorem Proof Using Similarity
This video shows a proof for the Pythagorean Theorem by breaking a right triangle into two similar triangles and setting up ratios of corresponding sides.
Khan Academy
Khan Academy: Triangles: Pythagorean Theorem Ii
More Pythagorean Theorem examples. Introduction to 45-45-90 triangles.
Imagine Learning Classroom
Learn Zillion: Find Tangent Value Using Side Ratios
In this lesson, you will learn how the ratios of certain sides of the triangle determine the tangent value of a particular angle by using properties of similar triangles. [2:13]
Study Pug
Study Pug: Pythagorean Theorem
In a nutshell, Pythagorean Theorem describes the relationship between the lengths and sides of a right triangle. Watch this video for a detailed explanation along with various examples. [8:48]
PatrickJMT
Patrick Jmt: Pythagorean Theorem
Video tutorial defines the Pythagorean theorem and features a few problems using it. [9:04]
Khan Academy
Khan Academy: Ca Geometry: More on Congruent and Similar Triangles
Worked examples of similar and congruent triangles.
Khan Academy
Khan Academy: Triangle Similarity & the Trigonometric Ratios
Sal explains how the trigonometric ratios are derived from triangle similarity considerations.
Khan Academy
Khan Academy: Geometry Word Problem: A Perfect Pool Shot
Sal uses triangle similarity to plan the perfect shot in a pool game.
Khan Academy
Khan Academy: Area of a Regular Hexagon
Using what we know about triangles to find the area of a regular hexagon.
Khan Academy
Khan Academy: Special Right Triangles Proof (Part 2)
Showing the ratios of the sides of a 45-45-90 triangle are 1:1:sqrt(2)
Khan Academy
Khan Academy: Special Right Triangles Intro (Part 2)
A few more 45-45-90 triangle examples and an introduction to 30-60-90 triangles.
Khan Academy
Khan Academy: Special Right Triangles Proof (Part 1)
Learn how to prove the ratios between the sides of a 30-60-90 triangle.
Khan Academy
Khan Academy: Special Right Triangles Intro (Part 1)
Introduction to 45-45-90 triangles.
Sophia Learning
Sophia: Using Right Triangle Trigonometry to Find the Area of Regular Polygons
This lesson will demonstrate how to use right triangle trigonometry and special right triangles (45-45-90 and 30-60-90) to find the area of triangles given the side lengths of the polygon. It is 3 of 4 in the series titled "Using Right...
Sophia Learning
Sophia: Using Right Triangle Trigonometry to Find the Area of Regular Polygons
This lesson will demonstrate how to use right triangle trigonometry and special right triangles (45-45-90 and 30-60-90) to find the area of triangles given the side lengths of the polygon.