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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
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 white circle: u+25d9 upper half inverse white circle: u+25da lower half inverse white circle: u+25db upper left quadrant circular arc: u+25dc upper right quadrant circular arc: u+25dd lower right ...
25D0 25E0 25F0 Symbol Name Symbol Name Symbol Name Last Hex# HTML Hex HTML Hex HTML Hex Dec Picture Dec Picture Dec Picture CIRCLE WITH LEFT HALF BLACK
Squircle centred on the origin (a = b = 0) with minor radius r = 1: x 4 + y 4 = 1A squircle is a shape intermediate between a square and a circle.There are at least two definitions of "squircle" in use, one based on the superellipse, the other arising from work in optics.
Radius: a line segment joining the centre of a circle with any single point on the circle itself; or the length of such a segment, which is half (the length of) a diameter. Usually, the radius is denoted and required to be a positive number. A circle with = is a degenerate case consisting of a single point.
A judge told the parents of 27-year-old Ellen Greenberg, a Philadelphia teacher found dead with 20 stab wounds in 2011, that the city's declaration of suicide was "puzzling."
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)