Moving Along the Circumference of a Circle?

I am attempting to create a prototype using the Side-Scroller template.
The player should run along the circumference of a circle with the camera tracking the player.

Illustrated in the gif below:

http://giphy.com/gifs/tjVlnRinrcAoM

  • Filled Circle represents player

  • Filled Rectangle represents camera

  • Semi-Circle represents camera’s field of vision

  • Black rings show the potential paths for camera and player.

Just struggling to convert the math into blueprints so that it effects the players position/direction.