Yes if a radar signal is going to the Aircraft from the side its angular shape in that area will return the radar. so for instance if you project the radar waves from down to the side it will reflect radar signals back to the source which is if you ask me a flaw in stealth. I remember reading somewhere that China purposely sacrificed some stealth features for higher maneuverability by introducing the canards which boosts radar signature of the J-20.
Okay here picture this:
Imagine radar waves to be tiny particles that are swimming in space. So they will keep on going and hitting a surface and bounce off of it in the same degree it hit it not being hindered by extra forces like friction and gravity. Radars give these wavelengths but it will only read it after it bounces off of the surface and then goes back to it to create a picture kind of like the sonar or a bat scream.
5th generation fighters do not mean that they do not get hit by radars due to some invisible force field as many imagine. it simply follows the concept of "Do not let those god damned tiny particles return to the source at all costs". The picture I posted above was just to point out that these fighters use straight lines and angles because their engineers would like to leave nothing for chance as each angle is studied by pointing radars on it and seeing the feed back.
To explain it further you have a straight line ________ that is 180 degrees:
This 180 degrees will be hit like this ____V____. The trick is to make sure it does not hit like this ____VI|___. The straight line is a structure in the Jet that will bounce off the radar instead of away from source to "Back to source".
Stealth follows many rules how angular the jet is flying. When the Fighter is making a turn for example the proposed ____V____ will turn into ____I____. Or for instance a Tor-M can lock into it the second it is immediately above it. Or AWACS if the AWACS was in the right position but these Fighters minimize the risk of all that. As a pilot you see with your radar or AW&CS radar if you want to remain hidden since your own radar can expose you and then EW suits and AESAs come in and the talk goes on and on and on and on and on since this is its own field of science.
Anyways I hope I was of help.