Bipyramid
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In geometry, a bipyramid, dipyramid, or double pyramid is a polyhedron formed by fusing two pyramids together base-to-base. The polygonal base of each pyramid must therefore be the same, and unless ot
Examples of rhombic bipyramids
Examples of disphenoids and of an 8-faced scalenohedron
Isosceles triangle
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In geometry, an isosceles triangle is a triangle that has two sides of equal length and two angles of equal measure. Sometimes it is specified as having exactly two sides of equal length, and sometime
Bipyramid
…the base is a regular polygon and the apices are on the perpendicular line through its center (a regular right bipyramid) then all of its faces are isosceles triangles; sometimes the name bipyramid refers specifically to symmetric regular right bipyramids, Examples of such bipyramids are the triangular bipyramid…
Triakis octahedron
Tetrakis hexahedron
Pentakis dodecahedron
Triakis icosahedron