Measurements - Need some help

[Geta-Ve]

Hey gang. So, I was attempting to create a 3d 'N' today and I ran in to a bit of an issue. For the life of me I can't figure out how to get each line of the N to be the same width. See image below. I want A and C to match in distance. B is reference measurement, if needed.

Is there some kind of calculation that I need to do? A formula? This is not imperitive by any means, and I was only doing it for funzies, but any aid would be awesome.

Cheers!