cosineRule (243B)
1 trig rule, used to find missing sides on a triangle 2 3 a^2 = b^2 + c^2 - 2bc cos(A) 4 5 when rearranged can be: 6 7 cos(A) = (b^2 + c^2 - a^2) / (2bc) // use this one when you only have side lengths 8 9 when using this use cos^-1 10 11 example in folder p1