Wikimedi'Òc

Archimedes pi.svg - Vinickw

Icosahedron-golden-rectangles.svg - Mysid

Kepler constant inverse.svg - XJaM

Approximation circle polygons.png - Myon12

Comparison of angles on a circle expressed in terms of tau and pi.png - FastilyClone

Mathematical constant Psi.png - Anatoly Wein

Foias 5e-2 svg.svg - Jochen Burghardt

Foias 5e-2.pdf - Jochen Burghardt

Sierpinski constant.gif - Avast rumali

Foias constant sequence.png - Matrix Computations

Michael Hartl talks about tau at BIL.jpg - Mhartl

Classes of Numbers.png - MuCephei14