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The word circle comes from the Latin word circulus, which is the diminutive of circus ("siege" ). It is a synonym for arena and, in everyday language, of circumference .

A circle, however, is the geometric place (set of points) of a plane that are equidistant from the center. The circle, on the other hand, is the geometric place of the points that are in a certain circumference . Therefore, the circle is the surface that is contained by the circumference, while this is the perimeter of that circle.

The center of the circle is coincident with the center of the circumference. It is known as radio to the segment that allows joining said center with any point of the perimeter. The largest segment that passes through the center and generates two semicircles by dividing the circle is called diameter .

As it happens with cube and square, the terms sphere and circle are often used as synonyms, although it is more common to hear the latter in any situation. From the history of Christopher Columbus and his misquoted phrase "the earth is round", people seem to ignore the depth of three-dimensional figures. This tendency, like many other similar ones, is responsible for the difficulty that many people have to understand concepts of geometry and arithmetic.

A very popular term is vicious circle, which represents a stage in the life of a person or a society that repeats indefinitely, usually with a negative connotation, as it seems impossible to interrupt. This series of events that take place in form cyclic, are a mental trap to not overcome a depression, or not to cross a certain obstacle that prevents our progress. Beyond its daily use by people without technical knowledge, it is a phenomenon studied by psychology and there are various treatments that have the purpose of guiding the patient towards an alternative path that allows him to finally move forward.

It is known as a circle, in another sense, to the organization or entity which allows a group of individuals who share interests to meet in a common space (physical or symbolic). For example: “The Circle of Readers of the City of Buenos Aires has organized a meeting with poets and novelists”, "Tomorrow I have to go to an event at the headquarters of the Military Circle", "Juan Eshicto was invited to read his texts in the Circle of Ibero-American Poets".

The Circle of Readers was founded in Barcelona, ​​Spain, in 1962 seeking to become a net of authors and readers to bring literature to as many people as possible. His proposal is to offer special editions of a long list of titles, which is renewed month by month. Over the years, its bases have changed and the current market model, which demands quality products and services at zero price, has undoubtedly affected this company. Subscribers receive a free catalog at home, although they accept in advance the commitment to buy a certain amount of books per month.

The publications of the Circle of Readers, which currently reach 63 countries around the world, do not enjoy an attractive finish; This represents one of its weak points, although it is not the only one. Being a movement literary with an international presence, it would be expected to promote those authors really committed to the lyrics, to enrich the readers; However, once again fashion and commercial trends prevail and succeed, leaving in the shadows the truly authentic and valuable content.

Circle is also a certain environment or context of society : "The president's words about abortion did not fall well in religious circles", "There is uncertainty in financial circles in the face of falling long-term deposits".

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