What would this angle have to be to allow a 0.032 inch or 0.040 inch (one millimeter ... ONE) plate of aluminum (as on the B-17) to deflect a three-quarter pound supersonic projectile? Is there an angle where a sheet of paper will deflect a pistol round? No. Not unless were talking hypothetical and academic. In real life situations the MK 108 round easily penetrated any aircraft skin it hit, at any angle.
It's the same principle as tank armor. Take even the KwK 43 and shoot it at the side of an M4 angled 80 degrees from perpendicular, and it will bounce off, despite having enough energy to punch through the side 7 times over. Because the tip of the shell does not engage the armor, there is no penetration, only deflection.
Now at any real angel, is it going to deflect? No, 1mm of armor isn't thick enough to gain any real benefits of effective thickness. If the tip engages, the round will penetrate. But dead 6? There's a chance of deflection off the wings and fuselage sides, not because the round isn't carrying enough energy, but because 95% of the energy isn't directed against the skin.
To answer your original question, I would guess 65+° for deflection to occur, depending on which round you posted above is impacting the skin. Far right would need ~75+° just because the tip is so steeply angeled.