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**n872yt3r****Member**- Registered: 2013-01-21
- Posts: 392

I finally learned how to do sines, cosines, and tangents of triangles. (Seriously, if you found out my age, you might be surprised ) I'm showing this for the younger ones out there.

A *sine* is the opposite side of the triangle divided by the hypotenuse. S=O/H. If you put this on a function grapher, like the one on Math Is Fun, or the CAS on GeoGebra, it makes a wave pattern.

A *cosine* is the adjacent side divided by the hypotenuse. C=A/H. If you put this on a function grapher, it also makes a wave pattern.

A *tangent* is the opposite side divided by the adjacent. T=O/A. On a circle, tangents are lines that touch the circle once, then go off... if you have two, it's like dumplings and chopsticks.

You can remember S=O/H, C=A/H, and T=O/A by thinking SOHCAHTOA. (so-cuh-to-uh)

Since I still can't upload pictures or links, I would appreciate posting a right angle with the corners labeled A, B, and C, the adjacent, hypotenuse, and opposite labeled, adjacent is A and C, opposite B and C, and hypotenuse A and B.

- n872yt3r

Math Is Fun Rocks!

By the power of the exponent, I square and cube you!

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,532

hi n872yt3r

Or point people to the excellent MIF pages, such as

http://www.mathsisfun.com/algebra/sohcahtoa.html

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**mathgogocart****Member**- Registered: 2012-04-29
- Posts: 1,431

yeah.I know sine,

Hey.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,658

Hi n872yt3r

And how old *are* you, if I may ask?

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

I would guess he is 9. And congratulations on learning about trigonometry.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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