Algebra+2+chapter+8

=TRIGONOMETRY

In this chapter you begin work on understanding the unit circle, working with 3 trig ratios (sine, cosine, and tangent) on the unit circle, discovering relationships on the unit circle, then extending the trig ratios to the x y coordinate plane. The chapter ends with 3 "laws" that you unpack during work on exercises before the laws themselves are formalized. The laws of sine and cosine will help you solve triangles (that is, determine the angle size or side lengths of triangles) while the third law, heron's formula, is a method for finding the area of triangles. We probably won't deal with heron's...

[|memorize unit circle] [|Use trig ratios to find side lengths]

[|Changing from degrees to radians] this video and the next 3 are for the mish mash handout

[|Changing from radians to degrees]

[|Angle sum formulas part 1]

[|Angle sum formulas part 2]

[|Proof of law of sines]

[|Law of Sines example 1] [|Law of Sines example 2] [|Law of Sines word problem]

[|Proof of law of cosines]

[|Law of cosines example 1] [|Law of cosines explained and example] [|Law of cosines cases and examples]

Help on graphing trig functions: [|examples 1] (when you see "pi", it's the same as 180 degrees...) [|examples #2] (same comment as before regarding "pi")