Perhaps either the polygon most important that it exists. All triangle possesss elements and the main ones are: vertex, sides, angles, heights, medium and bissetrizes. The quadrilateral is a polygon with four sides and the main quadrilaterals are: square, losango, keystone trapeze and. Losango is a parallelogram that has all the four congruentes sides. The one diagonal lines losango form an angle of 90o. Rectangle is a parallelogram with four straight angles and two pairs of parallel sides. Trapeze is a quadrilateral that only possesss two parallel opposing sides with distinct lengths, called lesser base and bigger base. It can be shown that the segment that binds the average points of the not parallel sides of a trapeze is parallel to the bases and its length is the arithmetic mean of the additions of the measures of the bases biggest and lesser of the trapeze. Of agreement with HORNUNG (1981), in terms of history of the art that deal with to the ornaments and the geometric forms, is very few the ones that will be able to interest the professional. A great number of treated referring to the meaning to the forms and geometric standards without being edited the years. In all to designer they it find good subsidies since that if she makes use to penetrate beyond the surface. On the language of designer, HORNUNG (1981) says that it is as the language of the writer, vast and has complex ramifications. The communication of the thought through any written language if constitutes in a peculiar art that, as all the arts, cannot be exerted with perfection, not to be by means of the total domain of its basic elements and for its constant application. It is certain that some people obtain to express with more easiness that the others, and possess dom of the manifestation of its ideas of the field of literature; but for nobody it will be easy to give form, all and the any instant, in accurate language adjusted, to the diverse ideas that cover the thought quickly.