The performer walks 36 ft to get to the top of the pole.
How to determine the distance covered by the performer
From the figure
The triangle is a right angled triangle
The height of the wall is opposite to angle 30⁰
The rope form the hypotenuse of the the triangle
Using sine ratio
Sinθ = opposite/hypotenuse
θ = 30⁰
hypotenuse = length of rope = L
opposite = height of wall
opposite = 18 ft
Therefore,
Sin30 = 18/L
Lsin30 = 18
L = 18/sin30
L = 18/0.5
L = 36 feet
The performer walks 36 ft to get to the top of the pole.