lower case letters = lengths
UPPER CASE LETTERS = ANGLES
sine rule
a/sinA = b/sinB = c/sinC
cosine rule
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.
Comments
Report
Report
Report
Report