Pentagrama y Phi

In this next figure (pinchar enlaces de abajo) is a regular pentagon with an inscribed pentagram.All the line segments found there are equal in length to one of the five line segments described below:The length of the black line segment is 1 unit.The length of the red line seqment, a, is Ø. The length of the yellow line seqment, b, is 1/Ø. The length of the green line seqment, c, is 1, like the black segment. The length of the blue line seqment, d, is (1/Ø)2, or equivalently, 1 - (1/Ø), as can be seen from examining the figure. (Note that b + d = 1).

http://kjmaclean.com/Geometry/PentOverview.html

Ver:http://i113.photobucket.com/albums/n205/leonsotelo/pentagramratios.gif

Aqui tenemos las potencias de Phi:
http://i113.photobucket.com/albums/n205/leonsotelo/fipot.gif

Y aqui historias de Phi,Fibonacci,... para no perderselo

http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/propsOfPhi.html#powers

León-Sotelo