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Mathematics
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Synopsis: Text from Wikipedia on the topic Triangle Rectangle.Source: Wikipedia.URL: http://pt.wikipedia.org/wiki/Tri%C3%A2ngulo_ret%C3%A2ngulo#Rela.C3.A7.C3.B5es_m.C3.A9tricas_do_tri.C3.A2ngulo_ret.C3.A2ngulo