Pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base. —
Regular pyramid is a regular pyramid whose base is a regular polygon.
Regular triangular pyramid is a pyramid with a right-angled triangle at its base extruding up to a single point.
h - height of a pyramid
a - base side
Regular rectangular pyramid is a pyramid with a square base and faces is equal isosceles triangles.
Tetrahedron is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners.
a - edge of a tetrahedron
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