# Angular Displacement - 2011 A-level question

 A disc rotates clockwise about its centre O until point P has moved to point Q, such that OP equals the length of the straight line PQ. What is the angular displacement of OQ relative to OP? A.   $\frac{\pi}{3} rad$ B.   $\frac{2\pi}{3} rad$ C.   $\frac{4\pi}{3} rad$ D.   $\frac{5\pi}{3} rad$