This math fractions ClipArt gallery offers 8 illustrations of a seven sided polygon broken into seventh slices. This includes images of individual slices, as well as the polygon with missing slices.
1/7 of a 7 sided polygon
2/7 of a 7 sided polygon
3/7 of a 7 sided polygon
4/7 of a 7 sided polygon
5/7 of a 7 sided polygon
6/7 of a 7 sided polygon
7/7 of a 7 sided polygon
7/7 of a 7 sided polygon with one piece detached