For the related molecular geometrical structure, see Trigonal bipyramid molecular geometry.

Template:Infobox face-uniform polyhedron In geometry, the triangular dipyramid (or bipyramid) is the first in the infinite set of face-transitive dipyramids. It is the dual of the triangular prism with 6 isosceles triangle faces.

It is also one of the Johnson solids, (J12) with equilateral triangle faces. As the name suggests, it can be constructed by joining two tetrahedra along one face. It is a convex deltahedron. Although all its faces are congruent and the solid is face-transitive, it is not a Platonic solid because some vertices adjoin three faces and others adjoin four. As a Johnson solid, with 6 equilateral triangles, it is also in the set of deltahedra.


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es:Bipirámide triangular eo:Triangula dupiramido fr:Diamant triangulaire ko:맞붙인 삼각뿔 nl:Driehoekige bipiramide ja:双三角錐 pt:Bipirâmide triangular th:พีระมิดคู่สามเหลี่ยม zh:雙三角錐