Basic trig ratios
Keep in mind that you can re-arrange these. You can also choose the other angle to be “Angle,” but remember to swap the adj and opp.
Inverse Trig Ratios
- Sum of the interior angles is 180°
Law of Sines
Law of cosines
If you are consistent in matching angles with their opposite sides, any side can be C.
Put quadratics into this form: