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2. File:Upper halfcircle with i.svg - Wikipedia

   en.wikipedia.org/wiki/File:Upper_halfcircle_with...

   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)

3. Harvey balls - Wikipedia

   en.wikipedia.org/wiki/Harvey_balls

   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

4. Semicircle - Wikipedia

   en.wikipedia.org/wiki/Semicircle

   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.

5. Geometric Shapes (Unicode block) - Wikipedia

   en.wikipedia.org/wiki/Geometric_Shapes_(Unicode...

   Control code graphics Geometric shapes: Assigned: 96 code points: Unused: 0 reserved code points: Unicode version history; 1.0.0 (1991) ... RIGHT HALF BLACK CIRCLE ...

6. File:Conformal mapping from right half plane to unit circle.svg

   en.wikipedia.org/wiki/File:Conformal_mapping...

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

7. Box-drawing characters - Wikipedia

   en.wikipedia.org/wiki/Box-drawing_characters

   On many Unix systems and early dial-up bulletin board systems the only common standard for box-drawing characters was the VT100 alternate character set (see also: DEC Special Graphics). The escape sequence Esc ( 0 switched the codes for lower-case ASCII letters to draw this set, and the sequence Esc ( B switched back:

8. AOL Mail

   mail.aol.com/?icid=aol.com-nav

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Circle - Wikipedia

   en.wikipedia.org/wiki/Circle

   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.