remember: (label the triangle opposite (angle), adjacent (angle) and hypotenuse.
SOH (sin) CAH (cos) TOA (tan)
Use the function multiplied by the angle equalling the length values (dividing) in the correct way eg.,
angle = 30•
opp = x
hyp = 5
so... use SOH
sin30 = x/5 so...
5sin30 = x
lower case letters = lengths
UPPER CASE LETTERS = ANGLES
a/sinA = b/sinB = c/sinC
a^2 = b^2 + c^2 - 2bc cosA (find length)
A = cos^-1 (b^2 + c^2 - a^2) / 2bc (find angle)
area of any triangle
1/2 * a * b * sinC
NB: these will be on the formula sheet in your exam paper.
NB: you may need to rearrange them to suit what you need, and dependent on the values you actually know.