Sine Law and Cosine Law

Although we often deal with right-angled triangles, many triangles do not have a right angle. The Sine Law and Cosine Law are often useful for those triangles.

The Sine Law:

sin(q_a)

a
=

sin(q_b)

b
=

sin(q_c)

c

The Cosine Law:
c² = a² + b² - 2ab cos(q_c)