Answer:
66.4
Step-by-step explanation:
Apply trignometric ratio
[tex] \cos( \gamma ) = \frac{adj \: side}{hypotenuse} \\ \cos( \gamma ) = \frac{6}{15} \\ \gamma = \cos ^{ - 1} ( \frac{6}{15} ) \\ \gamma = 66.4[/tex]
