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

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.

The locus of lines meeting three given skew lines. ("Regulus" is also the name of the brightest star in the constellation Leo.)