,
Circumradius,
Euler's Inequality,
Incenter,
Inradius,
Poncelet's Porism Explore with Wolfram|Alpha ReferencesAltshiller-Court, N. "Euler's Theorem." ยง152 in College Geometry: A Second Course in Plane Geometry for Colleges and Normal Schools, 2nd ed., rev. enl. New York: Barnes and Noble, pp. 85-86, 1952.Casey, J. A Sequel to the First Six Books of the Elements of Euclid, Containing an Easy Introduction to Modern Geometry with Numerous Examples, 6th ed. Dublin: Hodges, Figgis, & Co., 1888.Johnson, R. A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston, MA: Houghton Mifflin, 1929.Kazarinoff, N. D. Geometric Inequalities. New York: Random House, pp. 78-79, 1961.Mackay, J. S. "Historical Notes on a Geometrical Theorem and its Developments [18th Century]." Proc. Edinburgh Math. Soc. 5, 62-78, 1886-1887. Referenced on Wolfram|AlphaEuler Triangle Formula Cite this as:Weisstein, Eric W. "Euler Triangle Formula." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/EulerTriangleFormula.html
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