It doesn't need to have any at all.
It can possibly have one.
It can't have more than one.
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circle: no corner triangle: 3 corners rectangle and square:4 corners pentagon:5 corners
A triangle has 3 sides (or edges) and 3 corners (or angles)
A right triangle has 3 corners, or vertices.
1 is the triangle
3 All triangles have 3 corners which are their vertices and it is the plural of vertex.