What you're trying to say is that if you squash down and thicken the 0.4 block to be the same height and mass of the 0.566 piece, it will be 0.566 units thick, too. Hmm, I don't know.Jorzi wrote:If you examine the picture carefully, you will see that while the sloping increases the effective thickness of the armor, it equally reduces the effective area of protection. If you make both the same size, the increased weight of the sloped armor will exactly equal that of a straight piece with a thickness of 0.566
Even so, I still think there are stability and kinetic advantages to having sloped armor. Also, there's the side armor to account for.
When you have a big cubic block as your frontal armor, there's no room to finagle odd shaped things into it; (Mechanical and digital objects are almost never cubic in shape). This means, in order to fit that stuff in, you may wind up with a longer tank design which inevitably means more mass and less speed.