Respuesta :

Law of cosines:

c^2 = a^2 +b^2 - 2*a*b*cos(C)

c^2 = 80^2 + 104^2 - 2*80*104*(cos51.2)

c^2 = 6789.312

c = SQRT(6789.312)

c = 82.4 = 82 yards.


The answer is C.