Acute Triangle

Pronunciation: /əˈkyut ˈtraɪˌæŋ gəl/ ?

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Manipulative 1: Acute triangle.

An acute triangle is a triangle where all of the angles are acute angles.[1] An acute angle is an angle with a measure of less than 90° (π/2 radians). Since all triangles that do not have a right angle are scalene triangles, all acute triangles are acute scalene triangles.

References

  1. acute triangle. merriam-webster.com. Encyclopedia Britannica. (Accessed: 2009-12-21). http://www.merriam-webster.com/dictionary/acute triangle.
  2. Casey, John, LL.D., F.R.S.. The First Six Books of the Elements of Euclid, pg 8. Translated by Casey, John, LL.D. F.R.S.. Hodges, Figgis & Co., 1890. (Accessed: 2010-01-02). http://www.archive.org/stream/firstsixbooksofe00caseuoft#page/8/mode/1up/search/acute.
  3. Le Clerc, Sébastien; Nattes, John Claude; . Nattes's practical geometry, or, Introduction to perspective, pg 11. Translated by Pyne, W. H.. W. Miller, 1805. (Accessed: 2010-01-26). http://www.archive.org/stream/nattesspractical00leclrich#page/11/mode/1up/search/acute.

More Information

  • McAdams, David. Acute Angle. allmathwords.org. All Math Words Encyclopedia. Life is a Story Problem LLC. 2009-03-12. http://www.allmathwords.org/article.aspx?lang=en&id=Acute%20Angle.
  • McAdams, David. Triangle. allmathwords.org. All Math Words Encyclopedia. Life is a Story Problem LLC. 2009-03-12. http://www.allmathwords.org/article.aspx?lang=en&id=Triangle.

Printed Resources

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Acute Triangle. 2010-01-26. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/a/acutetriangle.html.

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2010-01-26: Authored (McAdams, David.)

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