Many 3d shapes have a corner.
is it a vertex
Possibly a cone
The question is not particularly clear but I suspect that the answer is a vertex.
Cuboid would be an example.
sides are the face of a 3d shape and verticies are the corner of the shape
corner is an other word for vertex it is the corner of a 3d shape
It is called a vertex.
a vercitie is a corner of a 3d shape such as a cube or a cuboid
A right angle.
They are called a Vertices and it is where 2 edges meet.