The given triangle is a right angle triangle. Taking angle E as the reference angle,
hypotenuse = EF = x
Adjacent side = GE = 71
To find EF, we would apply the cosine trigonometric ratio which is expressed as
Cos# = adjacent side/hypotenuse
# = 6 degrees
Thus,
Cos 6 = 71/EF
EFCos 6 = 71
EF = 71/Cos 6 = 71/0.9945
EF = 71.39
Rounding to the nearest tenth,
EF = 71.4 feet