Trigonometry Flashcards
1
Q
Sine rule for finding side?
A
a b c
— = —- = —-
sin A sinB sinC
2
Q
Sine rule when finding angle?
A
sin A sinB sinC
—— = ——- = ——-
a b c
3
Q
Cosine rule when finding a side?
A
a^2 =b^2 + c^2 - 2bc CosA
4
Q
Cosine rule when finding angle?
A
b^2 +c^2-a^2
CosA= ——————–
2bc
5
Q
When to use the Sine rule?
A
Two angles plus any side.
6
Q
When to use cosine rule?
A
- Two sides plus an included angle.
- All three sides and no angle.
