Develop spatial imagination
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Regular triangular pyramid
At the base of the pyramid is a regular triangle (all sides are equal, the angles between the base's sides are 60 degrees).
The height of the pyramid is exactly at the center of the triangular base.
If the pyramid's sides are the same as the base are regular triangles, then such a pyramid can be called a tetrahedron.
Length = 145
Width = 125
Height = 45
Length = 88
Width = 76
Height = 85
Length = 100
Width = 85
Height = 145
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