Antiprism
A Semiregular Polyhedron constructed with 2 
-gons and 
Triangles. The 3-antiprism issimply the Octahedron. The Duals are the Trapezohedra. TheSurface Area of a -gonal antiprism is
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See also Octahedron, Prism, Prismoid, Trapezohedron
References
Ball, W. W. R. and Coxeter, H. S. M. ``Polyhedra.'' Ch. 5 in Mathematical Recreations and Essays, 13th ed. New York: Dover, p. 130, 1987. Cromwell, P. R. Polyhedra. New York: Cambridge University Press, pp. 85-86, 1997.
Weisstein, E. W. ``SolidGeometry.'' Mathematica notebook SolidGeometry.m.
- Heegaard Diagram
- Heegaard Splitting
- Heegner Number
- Heesch Number
- Heesch's Problem
- Height
- Heilbronn Triangle Problem
- Heine-Borel Theorem
- Heine Hypergeometric Series
- Heisenberg Group
- Heisenberg Space
- Held Group
- Helen of Geometers
- Helicoid
- Helix
- Helly Number
- Helly's Theorem
- Helmholtz Differential Equation
- Helmholtz Differential Equation--Bipolar Coordinates
- Helmholtz Differential Equation--Cartesian Coordinates
- Helmholtz Differential Equation--Circular Cylindrical Coordinates
- Helmholtz Differential Equation--Confocal Ellipsoidal Coordinates
- Helmholtz Differential Equation--Confocal Paraboloidal Coordinates
- Helmholtz Differential Equation--Conical Coordinates
- Helmholtz Differential Equation--Elliptic Cylindrical Coordinates