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A level set in three dimensions.

The line bisecting a given line segment P_1P_2 can be constructed geometrically, as illustrated above.

The inverse curve of the lituus is an Archimedean spiral with m=2, which is Fermat's spiral.

The inverse curve of the logarithmic spiral r=e^(atheta) with inversion center at the origin and inversion radius k is the logarithmic spiral r=ke^(-atheta).

The radial curve of the logarithmic spiral is another logarithmic spiral.

An equilateral parallelogram whose acute angles are 45 degrees. Sometimes, the restriction to 45 degrees is dropped, and it is required only that two opposite angles are ...

A major arc (right figure) is an arc of a circle having measure greater than or equal to 180 degrees (pi radians).

The dual of the rhombidodecadodecahedron U_(38) and Wenninger dual W_(76).

The 30-faced dual of the truncated dodecadodecahedron and Wenninger dual W_(98).

The dual of the snub icosidodecadodecahedron U_(44) and Wenninger dual W_(112).