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The upper half-circle with radius a with a dot at the number i in the complex plane. See also Image:ContourDiagram.png: Date: 14 March 2007, 12:42 (UTC) Source: Own work: Author: Jitse Niesen: Permission (Reusing this file)
A circle divided into a gibbous shape (light grey) and an astronomical crescent shape (dark grey) by a half-ellipse, where the major axis of the ellipse coincides with a diameter of the circle. According to geometry, an illuminated hemisphere of a sphere will appear to take on such gibbous or crescent shapes when viewed from an angle.
PR is the diameter of a circle centered on O; its radius AO is the arithmetic mean of a and b. Using the geometric mean theorem, triangle PGR's altitude GQ is the geometric mean. For any ratio a:b, AO ≥ GQ. A semicircle can be used to construct the arithmetic and geometric means of two lengths using straight-edge and compass.
Heavy circle ⬤ U+2B24: 11044: Black large circle U+25D0: 9680: Circle with left half black U+25D1: 9681: Circle with right half black U+25D2: 9682: Circle with lower half black U+25D3: 9683: Circle with upper half black U+25D4: 9684: Circle with upper right quadrant black U+25D5: 9685: Circle with all but upper left quadrant black
The following is a list of centroids of various two-dimensional and three-dimensional objects. The centroid of an object in -dimensional space is the intersection of all hyperplanes that divide into two parts of equal moment about the hyperplane.
This is a list of two-dimensional geometric shapes in Euclidean and other geometries. For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes.
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circle with left half black: u+25d0 circle with right half black: u+25d1 circle with lower half black: u+25d2 circle with upper half black: u+25d3 circle with upper right quadrant black: u+25d4 circle with all but upper left quadrant black: u+25d5 left half black circle: u+25d6 right half black circle: u+25d7 inverse bullet: u+25d8 inverse ...