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  2. Harold R. Jacobs - Wikipedia

    en.wikipedia.org/wiki/Harold_R._Jacobs

    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.

  3. Harold Jacobs - Wikipedia

    en.wikipedia.org/wiki/Harold_Jacobs

    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

  4. Jacobi's theorem (geometry) - Wikipedia

    en.wikipedia.org/wiki/Jacobi's_theorem_(geometry)

    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.

  5. Crossed ladders problem - Wikipedia

    en.wikipedia.org/wiki/Crossed_ladders_problem

    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.

  6. Isosceles triangle - Wikipedia

    en.wikipedia.org/wiki/Isosceles_triangle

    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.

  7. Journal of Geometry - Wikipedia

    en.wikipedia.org/wiki/Journal_of_Geometry

    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]