Angling might help under certain scenarios, but this tactic usually exposes your side armor and a round landing on the turret or chassis side can equal a knock-out, especially coming from a high velocity gun capable of penetrating a medium tank armor at any angle/distance. I recommend testing at the Firing Range, shooting the tanks at various ranges, angles.
The game physics can act a bit more random against moving targets and that's what makes the whole tanking business fun, at times