Formulas - Last units before final

Question 1

Right triangle Trigonometry

Answer 1

All angles in a triangle add to 180º
a² + b² = c²

sinθ = O/H
cscθ = H/O

cosθ = A/H
secθ = H/A

tanθ = O/A
cotθ = A/O

solve for trig functions or missing angles and sides using trig identities, resort to pythagorean theorem last

Question 2

Sine Law

Answer 2

sinA/a = sinB/b = sinC/c

Question 3

Cosine Laws

Answer 3

a² = b² + c² - 2bc * cosA
b² = a² + c² - 2ac * cosB
c² = a² + b² - 2ab * cosC