Re: sin/sind

From: Richard Edgar (rge21_at_astro.su.se)
Date: 06/04/04 

Date: Fri, 04 Jun 2004 18:54:11 +0200

Les wrote:
>>My "scientific" calculator has units of "GRAD" which don't seem to be
>>defined in the "manual". In units of GRAD's, sin 100 =1, sin 200=0 ,
>>sin 300=-1.
>>
>>So 100 GRAD's = 90 Degrees.
>>
>>It isn't obvious what "GRAD" is short for ... it uses "RAD" for units
>>of radians.
>
> Grad is short for "gradians" and is a very popular unit of angular measure
> among the surveying community especially in Europe (eg Eastern) and North
> Africa.

And (going off topic, and back a few years) it always made for a neat
trick to play on other pupil's calculators when I was in school. Change
the calculators from degrees to gradians. They would then get answers
which were almost-but-not-quite right. If you changed the calculators to
work in radians, the answers would be obviously 'wrong' (if you thought
you were working in degrees).

:-)

Richard

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