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A pyramid is a polyhedron bounded by a base, which is a polygon any, and faces that are triangles coincident at a point called the apex.
The apex or top is also called the vertex of the pyramid, while a pyramid has more vertices, as many as the number of polygons that limit. Types

pyramids

straight A pyramid is a type of pyramid whose lateral faces are isosceles triangles. In this type of pyramid perpendicular to the base line passing through the apex to the base cut its circumcenter. Oblique
-A pyramid is one in which not all sides are isosceles triangles.
-A regular pyramid is a pyramid straight whose base is a regular polygon.

-A pyramid is based on a convex polygon convex and concave pyramid's base is a concave polygon.
There are three types of pyramids whose faces are equilateral triangles, with bases of 3, 4 and 5 sides respectively. A tetrahedron is a pyramid whose sides (base and sides) are equilateral triangles.