From YouTube, produced by Sal Khan of Khan Academy

In thiss video, the instructor offers a simple proof of the Law of Sines. In an easy conversational tone, the instructor uses the computer screen Paint program) as his 'blackboard' and different colors to emphasis his points. For high school students....[more]

This video has another example of figuring out the sine, cosine, and tangent of an angle in a right triangle. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. Fo...r high school students. (09:56)[more]

From YouTube, produced by Sal Khan of Khan Academy

In the video, the instructor explores the proof of the trig identity sin(a+b) = (cos a)(sin b) + (sin a)(cos b). In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. ...For high school students.[more]

From YouTube, produced by Sal Khan of Khan Academy

The instructor shows how to use trigonometric functions to solve the sides of a right triangle. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. For high school s...tudents.[more]

In this segment, the instructor is discusses the off-track ship captain that was started in Part One. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. For high sc...hool students. (02:51/[more]

From YouTube, produced by Sal Khan of Khan Academy

Determining the amplitude and period of sine and cosine functions. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. For high school students.

From YouTube, produced by Sal Khan of Khan Academy

This video has a couple of more examples of using trig functions to solve the sides of a triangle. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. For high schoo...l students.[more]

Salman Khan starts immediately by asking you to pause the video and guess the unknown values of the isosceles triangle and then shows the viewer how to solve the answers step-by-step. (09:42)

Introduction to the law of cosines to solve for a side of a triangle when 2 sides and an angle are known. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. For hig...h school students. (09:26)[more]

Please make your comments on categories positive, and not just negative.

People work hard on educational categories, and we want to encourage them to make more!

Profanity (curse words), sexually suggestive remarks, and other such obviously inappropriate comments
will be deleted immediately, and are grounds for immediate expulsion. Remember, children use this website.

Personal criticism on project forums and in video content is not allowed and will be deleted immediately.
Any violations of this rule could result in expulsion from the project so please, no insults or other negative
personal remarks.

Very harshly-worded criticism of content will also be deleted promptly. Please use your vote to express your
harshest feelings. Repeated violations of this rule can result in expulsion. If you must criticize another
person's hard work, then be nice about it.

People work hard on educational categories, and we want to encourage them to make more!