Trigonometry

1. Hypotenuse

   Annotations:

   • Side directly opposite to the right angle in a right triangle
2. Adjacent

   Annotations:

   • Side that forms the angle theta with the hypotenuse. The hypotenuse can't be the adjacent angle.
3. Opposite

   Annotations:

   • Side directly opposite to theta and that doesn't contribute to it's formation.

1. Tangent (tan)

   Annotations:

   •                         Opposite tan(theta) = -----------------                          Adjacent
2. Cosine (cos)

   Annotations:

   •                            Adjacent Cos(theta) = --------------------                           Hypotenuse
3. Sine (sin)

   Annotations:

   •                        Opposite Sin(theta) =  ---------------                        Hypotenuse
4. SOH CAH TOA

   Annotations:

   • SOH: sin = opposite/hypotenuse CAH: cos = adjacent/hypotenuse TOA: tan = opposite/adjacent
5. Finding angles

   Annotations:

   • If the ratio equation ends up similar to                         3 Sin(theta)= -----                                           2 then:                                             3 Theta = sin^-1 ( ---- )                                                      2
6. The unit circle

   Annotations:

   • A circle with a radius of one unit that is devided into four quadrants. it is used to measure the sin and cos of various angles. [pic in book]

Annotations:

• Clockwise measurements of angles by comparing them to true north direction (directly up). 

1. Tips

   Annotations:

   • Do / use diagram (as accurate as possible and/or well labeled. Follow all inststructions Will most likely lead to SOHCAHTOA question Solve

Annotations:

• generally involve pithagoras in 3d figures (cubes, etc) can be quite long and time consuming

1. Tips

   Annotations:

   • read several times, can often cause epiphany look at diagrams caefully draw surfaces of figure if helpfull (can ask for spare paper)