5 at 5 o'clock in complex plane

[davidgtl]

Hi! I am working on a very important math project and I need the number 5 placed at 5 o'clock on a circle of radius 5.

I am unsure how the current API can achieve this. If this is an oversight I can attempt a PR, but I'm not sure how to best return the pair of coordinates of this position.

P.S. I am also trying to style the 5 with a box of padding 5 and corner radius 5, but I don't see any CSS-related units API, let me know if it's in scope and I should open an issue.