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Senia amb moviment armònic simple
Construcció feta a partir de
http://www.geogebratube.org/student/m49736
Fotos en https://www.dropbox.com/s/o2g5bj3h7j72vyg/noria1.jpg
https://www.dropbox.com/s/0ga156ccbg1nnws/noria2.jpg