Answer:
γ = 97.77°
Step-by-step explanation:
A = 6.8
B = 8.4
C = 11.5
To find γ, apply the angle version of the Law of Cosines:
Cos γ = (A² + B² - C²)/(2AB)
Plug in the values
Cos γ = (6.8² + 8.4² - 11.5²)/(2*6.8*8.4)
Cos γ = -15.45/114.24
Cos γ = -0.1352
γ = Cos^{-1}(-0.1352)
γ = 97.77° (nearest hundredth)
