Answer: 33.59
Explanation:
Triangle ABC is a right angle triangle.
From the given right angle triangle
AB represents the hypotenuse of the right angle triangle.
With 15 degrees as the reference angle,
BC represents the adjacent side of the right angle triangle.
AC represents the opposite side of the right angle triangle.
To determine a, we would apply trigonometric ratio
Tan θ = opposite side/adjacent side. Therefore,
Tan 15 = 9/a
0.2679 = 9/a
a = 9/0.2679
a = 33.59