Question

Find the value of x.

Round to the nearest tenth.
A
63
B
142°
X
61
C
X
x = [?]
Law of Cosines: c² = a² + b² - 2ab cos C
Enter

Answer 1

Answer: 117.2

Explanation:

c² = a² + b² - 2ab cos C

b²= a² + c² - 2ac cosB

x² = 61² + 63² - 2(61)(63) cos142

x²= 13746.65065

x ≈ 117.2