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In three-dimensional geometry, the girth of a geometric object, in a certain direction, is the perimeter of its parallel projection in that direction. [ 1 ] [ 2 ] For instance, the girth of a unit cube in a direction parallel to one of the three coordinate axes is four: it projects to a unit square , which has four as its perimeter.
A review published in the 2007 issue of BJU International showed the average erect penis length to be 14–16 cm (5.5–6.3 in) and girth to be 12–13 cm (4.7–5.1 in). The paper compared results of twelve studies conducted on different populations in several countries.
Girth (functional analysis), the length of the shortest centrally symmetric simple closed curve on the unit sphere of a Banach space; Girth (geometry), the perimeter of a parallel projection of a shape; Girth (graph theory), the length of a shortest cycle contained in a graph; Matroid girth, the size of the smallest circuit in a matroid
Girth is the dual concept to edge connectivity, in the sense that the girth of a planar graph is the edge connectivity of its dual graph, and vice versa. These concepts are unified in matroid theory by the girth of a matroid, the size of the smallest dependent set in the matroid.
Among all primates, the human penis is the largest in girth, but is comparable to the chimpanzee penis and the penises of certain other primates in length. [13] Penis size is affected by genetics, but also by environmental factors such as fertility medications [14] [unreliable medical source?] and chemical/pollution exposure.
Penis reduction or penis reduction surgery refers to efforts or an assortment of techniques intended to decrease the girth or length of the human penis, especially when erect. The motive behind such a procedure can range from complications such as macropenis, [1] [2] genital lymphedema, [3] or sex reassignment. [4]