Question

How to solve it? I dont know the solving ways​

Answer 1

6.2 cm

Explanation:

Apply the Law of cosines, given as:

c² = a² + b² - 2ab×Cos(C)

Where,

a = 4 cm

b = 8 cm

c = AB = ??

C = 50°

Plug in the value into the equation

c² = 4² + 8² - 2*4*8*Cos(50)

c² = 16 + 64 - 64*Cos(50)

c² = 80 - 64*Cos(50)

c² = 38.861593

c = √38.861593

c = 6.2 cm (nearest tenth)