Every triangle has.
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No such shape exists.
There is no such shape. If it has two sides meeting, it also has to have a corner. A triangle has three sides and three corners, and a square has four sides and four corners. There is nothing in between.
A shape that it is 3D and has sides, corners and faces
That's impossible, because if a shape has sides, then it means it has corners, and vice versa.
This shape has ten sides