Maths - triangles

Pythagoras

a² + b² = c²

Sine rule

A / sin(a) = B / sin(b)

Cosine rule for a side

a² = b² + c² - 2bc cos(A)

Cosine rule for an angle

Cos(A) = b² + c² - a² / 2bc

Area from a triangle

Area = ½ ab sin(C)