Precalculus on Khan Academy: You may think that precalculus is simply the course you take before calculus. You would be right, of course, but that definition doesn’t mean anything unless you have some knowledge of what calculus is. Let’s keep it simple, shall we? Calculus is a conceptual framework which provides systematic techniques for solving problems. These problems are appropriately applicable to analytic geometry and algebra. Therefore….precalculus gives you the background for the mathematical concepts, problems, issues and techniques that appear in calculus, including trigonometry, functions, complex numbers, vectors, matrices, and others. There you have it ladies and gentlemen….an introduction to precalculus!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We’ve also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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I go over examples of evaluating Linear Speed, Angular Speed, and finding Arc Length while measuring rotation using radians. In this video I keep saying Velocity matching language of textbooks I have used in the past, but since the measure of velocity also incorporates direction I should be saying speed. Linear & Angular Speed Part…

Free AutoCAD add-on utility DimCurve by CAD Studio lets you dimension lengths of any curve type. You can also dimension the distance between two points on the curve. Download from http://www.cadstudio.cz/freeware