Class 12: Trig and Two Laws

Trigonometry as Ratios on right triangles:

• • sine

  • cosine

  • tangent

Use Your Calculator Appropriately (and sine inverse to get the angle)

• • if you need extra help, the 8 questions at the bottom of this page are useful.

Law of Sines:

• proof in class, here it is again.

Law of Cosines:

• • in class I said "trust me." For those of you that find "trust me" isn't enough ...

  • here is a new proof for Law of Sines as well as one for Law of Cosines.

  • this video is pretty good.

Notes we used are below, albeit blank. If you weren't in class, get these filled out.