Answer:
x = 31.3°
Step-by-step explanation:
[tex]cos (A) = \frac{b^{2} + c^{2} - a^{2} }{2bc} [/tex]
here a = 8 , b = 11 , c = 15
using the formula:
cos(x) = (11² + 15² - 8²) / ( 2 * 11 * 15)
cos(x) = [tex]\frac{47}{55} [/tex]
x = [tex]cos^{-1} (\frac{47}{55} )[/tex]
x = 31.3°
