1

Circular (part of one side would have to be straight in order to accommodate hinges)

2

Half circle

3

Octagonal

4

Oval shaped (75% taller than it is wide, 25% wider than it is tall)

5

Reached by steps down (probably only a couple, unless you have part of the dungeon level set somewhat deeper than the rest of the dungeon)

6

Reached by steps upward (possibly only a couple, possibly the door is quite high in the wall)

7

Square

8

Triangular (and might have to open on an angle if one side is not perpendicular to floor)

9

Very tall and very narrow

10

Wider than it is tall