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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.
In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image.It is a form of optical aberration that may be distinguished from other aberrations such as spherical aberration, coma, chromatic aberration, field curvature, and astigmatism in a sense that these impact the image sharpness without changing an ...
Ironing a shirt. Ironing is the use of an iron, usually heated, to remove wrinkles and unwanted creases from fabric. [1] The heating is commonly done to a temperature of 180–220 °C (360–430 °F), depending on the fabric. [2] Ironing works by loosening the bonds between the long-chain polymer molecules in the fibres of the material. While ...
This room contains laundry equipment such as a washing machine, tumble dryer, ironing boards and clothes iron. [13] The room is also used for closet organization and storage. The room would normally contain a second coat closet which is used to store seasonal clothing such as winter coats or clothing which are no longer used daily.
This process takes much less time than ironing with the usual iron and ironing board. There were many electric rotary ironers on the American market including Solent, Thor, Ironrite and Apex. By the 1940s the list had grown to include Bendix, General Electric, Kenmore and Maytag. [ 4 ]
A set {A, B, ..., Z} of points is independent, [AB...Z] if {A, B, ..., Z} is a minimal generating subset for the subspace AB...Z. The projective axioms may be supplemented by further axioms postulating limits on the dimension of the space. The minimum dimension is determined by the existence of an independent set of the required size.