It's called a heptagon, for the Greek prefix for seven, hept- or sept-.
A seven sided polygon in called a heptagon.
1200 sided figure is chiliadihectagon
A 17 sided figure is a heptadecagon.
you call a seven sided shape a heptagon.
Nonagon
it is a Dodecagon
icosikaihena
octogon
hexagon
a pentagon.
Nonagon.
A seven sided shape is called a heptagon.