3
None.A triangle (not traingle) has 3 vertices (not vetices).
5
8 vertices.
One
5 vertices
A dodecagon has twelve vertices.
A dodecagon has 12 vertices.
A dodecagon has 12 sides.
A dodecagon has 12 sides
A dodecagon has 12 sides and is a polygon.
A dodecagon is a 12 sided polygon