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The model is more detailed than the traditional down-mid-uptown divide by which downtown is the CBD, uptown the affluent residential outer ring, and midtown in between. Bid rent curve. Burgess's work helped generate the bid rent curve. This theory states that the concentric circles are based on the amount that people will pay for the land.
The result is a pattern of concentric rings of land use, creating the concentric zone model. It could be assumed that, according to this theory, the poorest houses and buildings would be on the very outskirts of the city, as this is the only location that they can afford to occupy.
Sociologist Ernest Burgess's prominent concentric circle model depicted urban areas as a series of concentric functional zones that sorted population groups. [77] [78] It proposed a central business core, circled by transitional immigrant and working class areas, then by more affluent outer commuter rings. [79]
The region of the plane between two concentric circles is an annulus, and analogously the region of space between two concentric spheres is a spherical shell. [6] For a given point c in the plane, the set of all circles having c as their center forms a pencil of circles. Each two circles in the pencil are concentric, and have different radii.
First, a large circle is constructed and its circumference is subdivided by 12 diameters into 12 arcs (of 30 degrees each; see regular dodecagon). Next, the radius of this circle is itself subdivided into 12 unit segments (radial units), and a series of concentric circles is constructed, each with radius incremented by one radial unit.
Diagram of ring theory showing circles of acquaintance and direction of travel for comfort and "dumping" Ring theory is a concept or paradigm in psychology that recommends a strategy for dealing with the stress a person may feel when someone they encounter, know or love is undergoing crisis. [ 1 ]
In the transformed chain, the tangent points between adjacent circles of the Steiner chain all lie on a circle, namely the concentric circle midway between the two fixed concentric circles. Since tangencies and circles are preserved under inversion, this property of all tangencies lying on a circle is also true in the original chain.
The cosmological model of concentric (or homocentric) spheres, developed by Eudoxus, Callippus, and Aristotle, employed celestial spheres all centered on the Earth. [1] [2] In this respect, it differed from the epicyclic and eccentric models with multiple centers, which were used by Ptolemy and other mathematical astronomers until the time of Copernicus.