Trig Rules

Question 1

Sine rule: for a side

Answer 1

A B
——— = ———
Sin(a) Sin(b)

Question 2

Sine rule: for an angle

Answer 2

Sin(a) Sin(b)
———— = ————
A B

Question 3

Cosine rule: for a side

Answer 3

a^2 = b^2 + c^2 - 2bc(cosA)

Question 4

Cosine rule: for an angle

Answer 4

CosA = b^2 + c^2 - a^2
————————
2bc