3.
Vertex (singular of Vertices) is the POINT of the sides (ray, segment, line) come together. For any triangle it always has 3 angles, and thus 3 points, which means 3 vertices. A right triangle is still an triangle, only that one of the 3 angles being 90 degree.
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A right triangle has 3 corners, or vertices.
3 vertices in a triangle, whether it is equilateral, isosceles or scalene; acute angled, right or obtuse.
Like all triangles it has 3 vertices.
A triangle has 3 vertices and 3 sides
A triangle has three sides and three vertices.