It is known that the world's tallest tilted skyscraper is located in Abu Dhabi with a tilt angle of $18^{\circ}$. Converting this tilt angle to radians is which of the following options? (Single choice, 5 points)\\
(1) $\frac{\pi}{36}$\\
(2) $\frac{\pi}{18}$\\
(3) $\frac{\pi}{20}$\\
(4) $\frac{\pi}{10}$\\
(5) $\frac{\pi}{8}$