TRIGONOMETRY ROCKS! [was: RE: FLASH: Scuttlebutt on F5 and current

[Kenny Sherwood]

books]

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At 23.48 -0400 2000.07.20, Jefferis Peterson wrote:


>Branden,

>It's been years since I studied algebra and trig... that's why I was

>hoping for a book that explained the math in relationship to the

>practical, visual examples. I was much better at geometry than trig,

>because I could see how the theorems made sense in relationship to

>something visual and concrete.


Hey Jefferis,


Cool to hear from you.


I'm a bit of an all-around math-whack-head (credentials available

upon request!) so I'll try to pitch in here and help a bit.


[I got me some cool trig URLs that I'll dig up at the end of this.]


Trig is mostly about right triangles and the understanding thereof.

Ya got 6 (think about it) relationships between any 2 chosen sides

(named around a non-90-degree angle: "opposite", "adjacent", and

"hypotenuse").


Sides' names are based upon where they stand in relationship to the

(NON-90-degree) angle that you're looking at.


Lemme try this if it can be quick:


           |\____

Opposite  |     \____   Hypotenuse ("anglish" thingy)

           |          \____

           |_____________*_\

               Adjacent        * = the angle under consideration here


Shoot, that took me 15 minutes!


So, briefly (then I get to go grab me a Heineken :-) ):


(1) sine = opposite over hypotenuse  SOH

(2) cosine = adjacent over hypotenuse  CAH

(3) tangent = opposite over adjacent  TOA   ----> "SOHCAHTOA" -- a mnemonic

(4) cotangent = inverse of tangent

(5) secant = inverse of cosine

(6) cosecant = inverse of sine


... it goes on-and-on, of course ...


OK ALREADY, here I go diggin' inta me archives ...


[Jefferis, at least some-a these are Really Groovy IMO; I think ya

oughta try "d" first, then "e".]


(a)

FlashLite Sq and Trig Libraries

http://www.flashlite.net/source/f4/other/index.html


(b)

Flash Bible - ActionScript - Plug & Play - Trigonometric Functions

http://www.FlashBible.com/Members/ActionScript/PlugNPlay/Trig.htm


(c)

The Trig Functions

http://www.sisweb.com/math/algebra/functions/trig/index.htm


(d)

Basic 2D Math

http://www.geocities.com/SiliconValley/2151/math2d.html


(e)

Basic 3D Math

http://www.geocities.com/SiliconValley/2151/math3d.html


GREAT that you're here, Jefferis; I always enjoy yer Qs and As (not

that I always have time to read 'em all! :-) ). (Bet that really

breaks yer heart, huh?!)


HTH etc.,


Kenny Sherwood

-


http://kensherwood.com



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