bn:03491788n
Noun Concept
AR
bipyramid الثلاثي  bipyramid ثلاثي الزوايا  bipyramid ثلاثي الزوايا،
EN
In geometry, the triangular bipyramid is a type of hexahedron, being the first in the infinite set of face-transitive bipyramids. Wikipedia
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