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Harold R. Jacobs (born 1939), who authored three mathematics books, both taught the subject and taught those who teach it. [1] Since retiring he has continued writing articles, and as of 2012 had lectured "at more than 200" math conferences. His books have been used by some homeschoolers [2] and has inspired followup works.
Harold M. Jacobs (1912–1995), Jewish and civic leader who headed a number of American Jewish organizations and institutions; also played a significant role in New York City educational affairs Harold R. Jacobs (born 1939), authored three widely used mathematics books, both taught the subject and taught those who teach it
Adjacent colored angles are equal in measure. The point N is the Jacobi point for triangle ABC and these angles.. In plane geometry, a Jacobi point is a point in the Euclidean plane determined by a triangle ABC and a triple of angles α, β, γ.
The crossed ladders theorem was extended to crossed ladders within a triangle. In 2002, Harold Joseph Stengel (1947–2007), an American secondary school teacher of mathematics, proved the extended theorem. [5] Let AC be the base of a triangle ABC.
In geometry, an isosceles triangle (/ aɪ ˈ s ɒ s ə l iː z /) is a triangle that has two sides of equal length or two angles of equal measure. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.
The Journal of Geometry is a triannual peer-reviewed scientific journal covering geometry, broadly considered. In particular this includes "foundations of geometry, geometric algebra, finite geometries, combinatorial geometry, and special geometries". [1] It was established in 1971 by Walter Benz [2] and is published by Birkhäuser. [1]