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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. 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.

4. File:Gibbous-Crescent-half-ellipse-in-circle-outlined.svg

   en.wikipedia.org/wiki/File:Gibbous-Crescent-half...

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Help; Learn to edit; Community portal; Recent changes; Upload file

5. List of centroids - Wikipedia

   en.wikipedia.org/wiki/List_of_centroids

   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.

6. Archimedean circle - Wikipedia

   en.wikipedia.org/wiki/Archimedean_circle

   In geometry, an Archimedean circle is any circle constructed from an arbelos that has the same radius as each of Archimedes' twin circles. If the arbelos is normed such that the diameter of its outer (largest) half circle has a length of 1 and r denotes the radius of any of the inner half circles, then the radius ρ of such an Archimedean ...

7. File:Gibbous-Crescent-half-ellipse-in-circle.svg - Wikipedia

   en.wikipedia.org/wiki/File:Gibbous-Crescent-half...

   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.