Official Guide
In the figure shown, \(PQRSTU\) is a regular polygon with sides of length x. What is the perimeter of triangle \(PRT\) in terms of x?

A. \(\dfrac{x\sqrt{3}}{2}\)

B. \(x\sqrt{3}\)

C. \(\dfrac{3x\sqrt{3}}{2}\)

D. \(3x\sqrt{3}\)

E. \(4x\sqrt{3}\)

OA D