The instructor in this video, Sal Khan, uses a graphing calculator to solve quadratic equations. Mr. Khan uses computer software (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education.... The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen. (10:510[more]

This video is an introduction to circles. The instructor explores the effect of changing parameters in the equation and graphing circles on a co-ordinate plane. He also instructs how to find the radius, center, and points on circumference. White boar...d in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. (06:49)[more]

This is an excellent video detailing how to make graphs of the sine and cosine functions. The tutorial details how to use the coordinate plane to make graphs of the function that are easy to read and understand. This is particularly useful for unders...tanding how to use the sine and cosine function. This is an excerpt. (03:40)[more]

Exploration of the parabola. Video reviews the axis of symmetry, the focus, the vertex. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. (09:48) Produ...ced by Robert Ahdoot, yaymath.org[more]

Examples of hyperbolas, starting at various points. Asymptotes, focii, and full graphing instructions provided. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and underst...andable. Produced by Robert Ahdoot, yaymath.org (06:12)[more]

Ellipses are another of the conic sections. The video reviews the major and minor axes, the focii, and graph in detail. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and... understandable. (06:21)[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!