Pre-Calculus: The Law of Sines

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Trigonometric functions (sin, cos, tan, etc) originally arose from the ratios of the sides of right triangles. But we can still use sine to evaluate the sines of angles that are in a triangle but not in a right triangle, using the Law of Sines. The Law of Sines states that [(sin a)/A] = [(sin b)/B] = [(sin c)/C], where a is the angle opposite side A (and so on for b/B and c/C). Sometimes the angles, a, b, and c, in this equation are denoted by the Greek symbols for alpha, beta, and gamma. Professor Burger shows you how to think about and use this this law by working through a number of different examples. This law lays the foundation for proving properties about triangles that don't have a right angle, including the calculation of the lengths of their sides and the measures of their angles.

This lesson is perfect for review for a CLEP test, mid-term, final, summer school, or personal growth!

Taught by Professor Edward Burger, this lesson was selected from a broader, comprehensive course, Precalculus.

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[warnexus]

@thebigcheese1100 nope this is the law of sine.

[thebigcheese1100]

deos this have anything to do with pathagoren theorum

[Orsiepompom]

I learnt this at school recently (kinda) but it's a shame that you have to pay for the whole lesson :/