um,,, a sphere, a cylinder and maybe a cone? no, a cone has 1 corner i think..im NT sure on the third one....maybe its just a circle..
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Vertices (singular vertex) are the corners.
3 All triangles have 3 corners which are their vertices and it is the plural of vertex.
An octagon has has 8 corners.
A triangle has 3 sides (or edges) and 3 corners (or angles)
How many significant figures are in 20.8