Two laws that solve any triangle — not just right ones.
Law of sines
a/sinA = b/sinB = c/sinC
Law of cosines
c² = a² + b² − 2ab cosC
Cosine law generalises Pythagoras — when C = 90°, cosC = 0 and you're back to a² + b² = c².
Two laws that solve any triangle — not just right ones.
Cosine law generalises Pythagoras — when C = 90°, cosC = 0 and you're back to a² + b² = c².