Originally Posted by
Iride01
Sounds like you are imagining planes going through the two that can be ninety degrees to each other. There are also planes that can go through them both that are parallel to each other.
If two lines don't intersect, then can't be perpendicular. There is a line from the midpoint of the cord that is perpendicular to the chord and also intersect the center of the circle. I just don't get why perpendicular really applies here and your rudimentary geometry knowledge can't even come up with a logical reason you can relate to me, and much less a theorem.
Listen, you clearly don't know what "perpendicular" means, and maybe you don't even know what "90 Degrees" means. Personally, I think the wedge of the cotter is what's confusing you. But I digress. It's a waste of time for me trying to explain it to you. Good luck in your 3D world.