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History of trigonometry (wiki) - equation for calculating sine. Sine function defines the relationship between the opposite side and the longest side of the triangle as a ratio.

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The Mathematics of the Heavens and the Earth: The Early History of Trigonometry (Hardcover)

The Mathematics of the Heavens and the Earth: The Early History of Trigonometry

"Beyond SOH-CAH-TOA: An Example Of How History Helps Us To Understand Trigonometry" by Sara Lack, a Eureka Math writer for A Story of Functions.

FEBRUARY 2013: Scholar of the Week: FDHS Daniel Powell Class of 2013 - Academics: AP Literature, AP Language and Composition, Honors English 9 and 10, Honors Geometry, Honors World History, Honors Biology, Spanish 1-4, Trigonometry Analysis Extra-Curricular Activities: National Honor Society, SGA, Swim Team, Mass Media Coordinator Daniel has been accepted to University of Maryland College Park, George Mason and Towson University.

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October Sky: A Memoir | book by Homer H. Hickam. Originally called Rocket Boys, and the inspiration for the movie of the same name, this is a great book for your teen reader. I dreamed of making a curriculum where students learn machining, technical drawing, chemistry, risk analysis, trigonometry and calculus right along side the characters. And it has some great social-cultural history for this immigrant rich, post WWII, working class community.

Could you have passed the 8th grade in 1895? "By the sixth grade I had memorized the Constitution and knew what it meant and why. I was deep into the history of the Nation, was studying Geometry, Trigonometry, and Algebra, knew ALL the countries of the world, their capitals and basic economies from studying Geography..."

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