Use Law of Cosine to solve the triangle a = 8, c = 4, B = 36° Find A,C, and b

Answer 1

b^2 = a^2+c^2 - 2ac * cos B

= 8^2 + 4^2 - 2(8)(4) (cos 36)

= 64 + 16 - 64*cos36

= 28.223-

the square root of that is APPROXIMATELY 5.312524...