Verified Answer :

wolf1728

That's basic trigonometry
Tangent 57 degrees = AC / 9
AC = Tangent 57 degrees 9
AC =  1.5399 9
AC =



13.8591



Rounding to one tenth =
13.9

robertparise76

Soh Cah Toa! :)

Sin = Opposite/Hypotenuse
Cos = Adjacent/Hypotenuse
Tan = Opposite/Adjacent 
You are looking for AC, which is opposite. And you are given Adjacent.

tan(57)*9 = length of B which is 13.85 units

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