It has 5 corners if it is a 3D shape like a piramid but if it is 2D it is 3
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A triangle has 3 sides (or edges) and 3 corners (or angles)
A right triangle has 3 corners, or vertices.
3 because of the corners.
3 All triangles have 3 corners which are their vertices and it is the plural of vertex.
They don't have corners, but angle intersects. There are 3 angle intersects.