Difference between revisions of "Trigonometry"

Revision as of 17:21, June 28, 2015 (view source) JoeyJ (Talk | contribs) (Add formulas) ← Older edit		Latest revision as of 20:47, July 13, 2016 (view source) DavidB4-bot (Talk | contribs) (→‎External links: clean up & uniformity)
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	*[http://id.mind.net/~zona/mmts/trigonometryRealms/introduction/rightTriangle/trigRightTriangle.html Trigonometry and Right Triangles]		*[http://id.mind.net/~zona/mmts/trigonometryRealms/introduction/rightTriangle/trigRightTriangle.html Trigonometry and Right Triangles]
−	[[category:mathematics]]	+	[[Category:Mathematics]]
	[[Category:Trigonometry]]		[[Category:Trigonometry]]

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Latest revision as of 20:47, July 13, 2016

Trigonometry is the study of angles and triangles, relying heavily on three basic functions: sine, cosine and tangent, and their inverses, Cotangent (Cot), Secant (sec) and Cosecant (csc). These functions are abbreviated as "sin", "cos" and "tan".

These functions are defined by reference to a "right triangle," which is a triangle in which one angle is 90 degrees.

A way to remember the relationships is the mnemonic SOH-CAH-TOA ("soak a toe"). Think of a man soaking his toe in a tub of water - preferably a three-sided tub!

• SOH: Sine = opposite over hypotenuse
• CAH: Cosine = adjacent over hypotenuse
• TOA: Tangent = opposite over adjacent

Formulas

Complementary formulas:

Pythagorean trigonometric identity:

External links

• Trigonometry and Right Triangles