How to detect a mouse click on a polygon with WinBGIm?

Question

I've been working on a Rubix cube and it's going good so far. Graphics were not necessary but I gave WinBGIm (a 'newer' graphics.h) a try since I'm still an amateur. It's going good, runs great in console and made a layer of graphics over it and drew all the shapes.

This is what I have right now:

All is well until I try to move onto mouse operations and I realize I have no way to detect if the mouse clicks a polygon (the arrows). WinBGIm itself doesn't have something like this. How do you think I can do this? It's a simple question if anyone has ever used WinBGIm. I'll add any extra info needed.