Please give defination of tringular pyramid and square pyramid

Dear student, 
For triangular pyramid -
A triangular pyramid is a pyramid with a triangle as a base and three triangular faces. It has four vertices or points and six edges.

For square pyramid -
A square pyramid is a pyramid with a square base. It is a pentahedron.
The best example of square pyramid is Great Pyramids of Egypt. If you look at a picture of these historical pyramids, you can see that their base is actually a square. Therefore, they are considered square pyramids.
Regards. 

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