How can you be cornered in a round room?

If someone presses you up against a wall and doesnt let you get out. It would be hard though. And kinda weird. Well, it would also depend on the radius of the room, because if it was extremely large it would be almost impossible to corner someone. However, if the radius was extremely small, much easier.

Well I suppose you could be stuck in a small part of the room, but not literally cornered.

This one is simple....one big goon runs at you, tackles you and PINS you against the wall. The shape of the wall itself becomes irrelevant once the hurtling body makes contact with you and immobilizes you, since the verbal meaning of "cornering" someone in context is about losing mobility and not about the shape of contact surfaces of the pinning surface. :p

you can't but you could be circled.

You're not cornered, you're rounded

when you are in between the floor and the side wall

Sure. There's a corner between the walls and the floor/ceiling, so if you are lying down or are floating up next to the ceiling, you can get cornered.

by a pushy person

have a bunch of people back you up to a wall with no way out then your stuck in the corner made of people