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In geometry, a nonagon (/ ˈ n ɒ n ə ɡ ɒ n /) or enneagon (/ ˈ ɛ n i ə ɡ ɒ n /) is a nine-sided polygon or 9-gon.. The name nonagon is a prefix hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century.
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A non-reversing mirror can be made by connecting two regular mirrors at their edges at a 90° angle. If the joint is positioned so that it is vertical, an observer looking into the angle sees a non-reversed image. Such an image is visible while looking toward the corner where the two mirrors meet.
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A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. In geometry, a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain.
In geometry, the mirror image of an object or two-dimensional figure is the virtual image formed by reflection in a plane mirror; it is of the same size as the original object, yet different, unless the object or figure has reflection symmetry (also known as a P-symmetry).
Please note that deleting superseded images ... Regular enneagon made in inkscape. 23:13, 16 April 2006: 750 × 750 (20 KB) Arrenlex: Regular nonagon made in inkscape