Vertices.
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There are 3 points and they are called vertices which is the plural of vertex.
A triangle is a polygon and one of the basic shapes in geometry with three edges and three vertices. The points of edges of a triangle are known as angles, corners or vertices.
A triangle with VERY round points is a circle. There is no geometric term for a triangle with rounded points, but a triangle with rounded sides is known as a Reuleaux triangle. It is similar to the shape used for the piston in a rotary engine.
The points in a triangle has to be 180 degrees to be a triangle.
A triangle.