Krista King Math
45-45-90 Triangles
45-45-90 triangles are half a square, which gives them a special status! The instructor explains the relationship of the sides of the 45-45-90 triangle using the Pythagorean Theorem as a reference.
Krista King Math
30-60-90 Triangles
Half of an equilateral triangle is a special right triangle. A video instructor shows how to find the pattern of the side lengths for a 30-60-90 triangle. She then applies the relationship to different examples.
Khan Academy
Khan Academy: Geometry: Ca Geometry: Circle Area Chords Tangent
Demonstrates solutions to problems #71-75 of California Geometry released state test questions. Problems address Pythagorean theorem, 45-45-90 triangles, 30-60-90 triangles, circumscribed polygons, area, chord length, tangents to circles...
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.
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.
Khan Academy
Khan Academy: Triangles: 30 60 90 Triangle Side Ratios Proof
This video explores proving the ratios between the sides of a 30-60-90 triangle.
Khan Academy
Khan Academy: Triangles: 45 45 90 Triangles
Students are provided an introduction to 45-45-90 triangles by watching a video tutorial.
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: Two Special Triangles
In this video tutorial, explore the 45-45-90 and 30-60-90 triangles and what the properties of each are. Check understanding with a quiz. [6:35]
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.
Sophia Learning
Sophia: Properties of Equilateral Triangles
Equilateral triangles are explored in this learning tutorial, which includes several videos [4:18; 4:18; 3:18] and a PowerPoint presentation. The lesson includes an introduction of equilateral triangles and their key characteristics....
Khan Academy
Khan Academy: Triangles: 30 60 90 Triangle Example Problem
Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem in this short video.
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: Geometry: Circle Area Chords Tangent
This video [10:06] contains touches the following topics: Pythagorean theorem, 45-45-90 triangles, 30-60-90 triangles, circumscribed polygons, area, chord length and tangents to circles.
Khan Academy
Khan Academy: Triangles: Pythagorean Theorem Ii
More Pythagorean Theorem examples. Introduction to 45-45-90 triangles.
Other
Mario's Math Tutoring: Act Math 21 Concepts to Boost Your Score
A video [48 mins, 48 sec] explaining 21 different math concepts to help students prepare for the ACT including; circumference; averages; probability; multiplication counting principle; functions; circles; percentages; factoring; rules of...
Khan Academy
Khan Academy: Right Triangle Geometry Harder Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a harder right triangle trigonometry problem.
Khan Academy
Khan Academy: Right Triangle Geometry Basic Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a basic right triangle trigonometry problem.
Khan Academy
Khan Academy: Right Triangle Word Problems Harder Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a right triangle word problem that is more challenging than other examples that are available.
Khan Academy
Khan Academy: Right Triangle Word Problems Basic Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a basic Right triangle word problem.
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.