What do you call a twelve-sided polygon?

A twelve-sided polygon is referred to as a dodecagon. The term "dodecagon" derives from the Greek words "dodeca," meaning twelve, and "gon," meaning angle or corner. Thus, this term specifically indicates a polygon that has twelve angles and twelve sides.

The other options represent different types of polygons. A decagon has ten sides, a hexadecagon has sixteen sides, and an octagon has eight sides. Understanding these definitions helps clarify why dodecagon is the accurate term for a twelve-sided figure.