Trigonometry formulas

area of the triangle

A = (base*height)/2

two area formulas using S

A = S*r = (abc)/4R, where S is the semi-perimeter

complicated area formula

A = ½ a b sin(gamma)

2R formulas

2R = sin gamma / c = sin beta / b = sin alpha / a

a²

a² = b² + c² - 2 b c cos (alpha)

b²

b² = a² + c² - 2 a c cos(beta)

c²

c² = a² + b² - 2 a b cos(gamma)