Prismatoid
A Polyhedron having two Polygons in Parallel planes as bases and Triangular or Trapezoidal lateral faces with one side lying in one base and the oppositeVertex or side lying in the other base. Examples include the Cube, PyramidalFrustum, Rectangular Parallelepiped, Prism, and Pyramid. Let 
be the Area of the lower base,
the Area of the upper base, 
the Area of the midsection, and 
the Altitude. Then
See also General Prismatoid, Prismoid
References
Beyer, W. H. CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, pp. 128 and 132, 1987.
- Articulation Vertex
- Artin Braid Group
- Artinian Group
- Artinian Ring
- Artin L-Function
- Artin Reciprocity
- Artin's Conjecture
- Artin's Constant
- Artin's Reciprocity Theorem
- Artistic Series
- ASA Theorem
- Aschbacher's Component Theorem
- A-Sequence
- Associative
- Associative Algebra
- Associative Magic Square
- ASS Theorem
- Astroid
- Astroidal Ellipsoid
- Astroid Evolute
- Astroid Involute
- Astroid Pedal Curve
- Astroid Radial Curve
- Asymptosy
- Asymptote