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A birotunda in which the bases are in the same orientation.

Coordinates defined by an orthocentric system.

Two or more lines or line segments which are perpendicular are said to be orthogonal.

A 50-sided polygon.

The metric ds^2=(dx^2+dy^2)/((1-|z|^2)^2) of the Poincaré hyperbolic disk.

The number q in a star polygon {p/q}.

A line segment on the boundary of a face, also called a side.

A point at which two polygon edges of a polygon meet.

The vertex of a polytope is a point where edges of the polytope meet.

A parameterization of a surface x(u,v) in u and v is regular if the tangent vectors (partialx)/(partialu) and (partialx)/(partialv) are always linearly independent.