Question

Find the side length, a.

Round to the nearest tenth.

A=29°
b=4
c=10

a=[?]

Answer 1

a = 6.8

Explanation:

Apply the Law of Cosines

a² = b² + c² - 2bc*Cos A

A = 29°

b = 4

c = 10

Plug in the values

a² = 4² + 10² - 2*4*10*Cos 29

a² = 116 - 69.9696

a² = 46.0304

a = √46.0304

a ≈ 6.8