From:	Erik Max Francis <max AT alcyone DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Newbie troubles with Sin and Cos
Date:	Tue, 25 Mar 1997 22:32:57 -0800
Organization:	Alcyone Systems
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Message-ID:	<3338C319.1992D124@alcyone.com>
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To:	djgpp AT delorie DOT com
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Kjell Franzen wrote:

> That have to be PI/180 to be correct, no? If You multiply by 180/PI the
> angle would be be about 57 times greater instead of 57 times smaller.
> (1 radian equals about 57,3 degrees).
> 
> > This changes the line from your example to
> >
> >   result = sin(theta*180/PI)
>                        ^^^^^^ should be : PI/180

Simple dimensional analysis.  pi rad = 180 deg, so deg times (pi rad/180
deg) gives rad.  You are correct; the conversion factor is pi/180.

-- 
       Erik Max Francis, &tSftDotIotE / email:  max AT alcyone DOT com
                     Alcyone Systems /    web:  http://www.alcyone.com/max/
San Jose, California, United States /    icbm:  37 20 07 N  121 53 38 W
                                   \
              "I am become death, / destroyer of worlds."
                                 / J. Robert Oppenheimer (quoting legend)

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