1
not a polygon, line
2
not a polygon, angle
3
triangle, 180 degrees
4
quadrilateral, 360 degrees
5
pentagon, 540 degrees
6
hexagon, 720 degrees
7
heptagon, 900 degrees
8
octagon, 1,080 degrees
9
nonagon, 1,260 degrees
10
decagon, 1,440 degrees
11
hendecagon, 1,620 degrees
12
dodecagon, 1,800 degrees