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A triangle has three sides and three vertices.
The vertices of a triangle are the endpoints. In other words, when the sides of the triangle intersect, they form a vertex of a triangle. A triangle has a total of three vertices.
A triangle has one face, three vertices and three edges.
It is a triangle.
"Vertices" means "vertexes". "Vertex" means one of the triangle's points. The triangle has three points. When you talk about two or three of them, you're talking about 2 or 3 'vertices'.