Answer
x = 17.6 m
Step-by-step explanation
In a right-angle triangle, the side opposite the right angle is the Hypotenuse, the side opposite the given angle that is non-right angle is the Opposite and the remaining side is the Adjacent.
For this question,
Hypotenuse = 18 m
Opposite = ?
Adjacent = x = ?
Angle = 12°
So, using trignometric relations, we know that CAH means that
Cos 12° = (Adj/Hyp)
Cos 12° = (x/18)
Cos 12° = 0.9781
Cos 12° = (x/18)
0.9781 = (x/18)
Cross multiply
x = 18 (0.9781)
x = 17.6 m
Hope this Helps!!!