In mathematics, a hexadecagon (sometimes called a hexakaidecagon or 16-gon) is a sixteen-sided polygon.
Heptadecagon (Wikipedia) In geometry, a heptadecagon, septadecagon or 17-gon is a seventeen-sided polygon.
Pentadecagon (Wikipedia) In geometry, a pentadecagon or pentakaidecagon or 15-gon is a fifteen-sided polygon.
