It is called the perimeter. How you calculate it depends upon the type of shape it is.
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2d shapes do not have edges or vertices
what are the 2d shapes of the real world
5 edges, 5 verts, and faces are only on 3d shapes, for the most part, so any 2d shape has 1
no. a 2d square has only 1 face but a 3d square (cube) has 6 faces.
the cylinder has 2 2d shapes: the 2 circles on the end