A 3-d triangle, or a tetrahedron, has 4 vertices.
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It has 5 corners if it is a 3D shape like a piramid but if it is 2D it is 3
A 3d rectangle, or a cuboid, has eight corners.
A right triangle has 3 corners, or vertices.
No corners and two edges !
A triangle has 3 sides (or edges) and 3 corners (or angles)