Clark circle system

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• Nine-point circle — The nine points In geometry, the nine point circle is a circle that can be constructed for any given triangle. It is so named because it passes through nine significant points defined from the triangle. These nine points are: The midpoint of each …   Wikipedia

• Orthocentric system — Orthocentric system. Notice any point is the orthocenter of the triangle formed by the other three. In geometry, an orthocentric system is a set of four points in the plane one of which is the orthocenter of the triangle formed by the other three …   Wikipedia

• Circumscribed circle — Circumscribed circle, C, and circumcenter, O, of a cyclic polygon, P In geometry, the circumscribed circle or circumcircle of a polygon is a circle which passes through all the vertices of the polygon. The center of this circle is called the… …   Wikipedia

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• National Register of Historic Places listings in Clark County, Ohio — Location of Clark County in Ohio This is a list of the National Register of Historic Places listings in Clark County, Ohio. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in… …   Wikipedia

• Manning Clark — in his study in about 1988 Charles Manning Hope Clark, AC (3 March 1915 – 23 May 1991), an Australian historian, was the author of the best known general history of Australia, his six volume A History of Australia, published between 1962 and 1987 …   Wikipedia

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