Traingulos
http://www.slideshare.net/guestcfeccd4/triangulos-1404352?from_search=7
http://www.slideshare.net/rafoso30/triangulos-3258399?from_search=12
Cuadrilateros
http://www.slideshare.net/oscabre/cuadrilateros-223541?from_search=1
http://www.slideshare.net/merenguedelinfinito/cuadrilateros-20692853?from_search=9
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