Khan Academy
Khan Academy: Triangles: Circumcenter of a Right Triangle
The video tutorial shows that the midpoint of the hypotenuse is the circumcenter.
Loyola University Chicago
Math Flix: Pythagorean Theorem Puzzle
This QuickTime movie uses a tangram-like puzzle to help understand the Pythagorean Theorem. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
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]
Sophia Learning
Sophia: Cosine: Lesson 3
The concept of the cosine of an angle is introduced here. This lesson [4:11] is 3 of 4 in the series titled "Cosine."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 2
This lesson shows how to draw a right triangle on a unit circle. It is 2 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 4
This lesson shows how to draw a right triangle on a unit circle. It is 4 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 5
This lesson shows how to draw a right triangle on a unit circle. It is 5 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 6
This lesson shows how to draw a right triangle on a unit circle. It is 6 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 7
This lesson shows how to draw a right triangle on a unit circle. It is 7 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 1
This lesson shows how to draw a right triangle on a unit circle. It is 1 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Sine: Lesson 5
The concept of the sine of an angle is introduced here. This lesson is 5 of 6 in the series titled "Sine."
Sophia Learning
Sophia: Sine: Lesson 6
The concept of the sine of an angle is introduced here. This lesson is 6 of 6 in the series titled "Sine."
Sophia Learning
Sophia: Triangles in the Unit Circle: Lesson 3
This lesson explores the relationships between triangles made on a unit circle and the six trigonometric functions. It is 3 of 5 in the series titled "Triangles in the Unit Circle."
Sophia Learning
Sophia: Triangles in the Unit Circle: Lesson 4
This lesson explores the relationships between triangles made on a unit circle and the six trigonometric functions. It is 4 of 5 in the series titled "Triangles in the Unit Circle."
Sophia Learning
Sophia: Triangles in the Unit Circle: Lesson 1
This lesson explores the relationships between triangles made on a unit circle and the six trigonometric functions. It is 1 of 5 in the series titled "Triangles in the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle
This lesson shows how to draw a right triangle on a unit circle.
Sophia Learning
Sophia: Coordinates on the Unit Circle: Lesson 1
The x and y coordinates of the unit circle are discussed here, in the context of right triangles. This lesson [3:19] is 1 of 5 in the series titled "Coordinates on the Unit Circle."
Sophia Learning
Sophia: Coordinates on the Unit Circle: Lesson 2
The x and y coordinates of the unit circle are discussed here, in the context of right triangles. This lesson [3:08] is 2 of 5 in the series titled "Coordinates on the Unit Circle."
Sophia Learning
Sophia: Coordinates on the Unit Circle: Lesson 3
The x and y coordinates of the unit circle are discussed here, in the context of right triangles. This lesson [1 min., 59 sec.] is 3 of 5 in the series titled "Coordinates on the Unit Circle."
Sophia Learning
Sophia: Coordinates on the Unit Circle
The x and y coordinates of the unit circle are discussed here, in the context of right triangles.
Sophia Learning
Sophia: Cosine: Lesson 1
The concept of the cosine of an angle is introduced here. This lesson is 1 of 4 in the series titled "Cosine." [3:01]
Sophia Learning
Sophia: Sine: Lesson 1
The concept of the sine of an angle is introduced here. This lesson is 1 of 6 in the series titled "Sine."