When the bottom surface is fixed, the triangular pyramid has one vertex, and when the bottom surface is not fixed, it has four vertices. (A regular triangular pyramid is different from a regular tetrahedron. Every face of a regular tetrahedron must be a regular triangle. )

H is the base height (normal length), A is the base area, V is the volume, L is the oblique height, and C is the circumference of the pyramid base:

The side expansion diagram of a triangular pyramid consists of four triangles, and the area of the expansion diagram is the side area of the pyramid, so: (where Si, i= 1, 2 is the area of the ith side).

S all =S pyramid side +S bottom

S regular triangular pyramid = 1/2CL+S base

V=S (bottom area) h (height) ÷3

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