A 12 sided shape is called a dodecagon.
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A dodecagon is a polygon that has twelve sides. A regular dodecagon has twelve internal angles of 150 degrees each.
A 15 sided shape is called a Pentadecagon, or a Pentakaidecagon.- thanks a million Chrissy . B -
Pentehedron
Dodecagon
what is the name of a 6 sided shape