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Math - Basics of Trigonometry - SOH CAH TOA

7/26/2011

 
Trigonometry is a branch of mathematics that studies triangles and the relationships between their sides and the angles between these sides.

Sinus? Cosinus? Tangent? These may be the only 3 words you remember from your trigonometry class. I remember a fourth one called SOH CAH TOA from my favorite high school math teacher. 

Remember:
  • SINUS of an angle is the length of its OPPOSITE side over the length of the HYPOTENUSE, hence SOH.
  • COSINUS of an angle is the length of its ADJACENT side over the length of the HYPOTENUSE, hence CAH.
  • TANGENT of an angle is the length of its OPPOSITE side over its ADJACENT side, hence TOA.
Altogether we get SOH CAH TOA
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Trigonometry is an important topic in secondary school mathematics. Without a solid foundation in the subject, one cannot excel in differential and integral calculus which are pre-requisite math courses in many university programs.

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