New code for review: ArcAngle

Question

Given a circle and a regular polygon in it, computes the length of the arc subtended by a side, and the angle subtending them both.
Replaces my previous efforts in C++ (I find that programs solving single problems like this, are easiest to make with the instruction we get at SL.)
Questions? Comments? Concerns?
Upvotes?

Answer 1

Updated ArcAngle to v0.0174444 FINAL. Completely restructured: functional instead of procedural.
Questions, comments, concerns? Upvotes? :)