Re: LOGO-L> Total Turtle Trip

[George Mills <mills@softronix.com>]

> Brian Harvey wrote:
> 
> And the 15-year-old has been taught x^2 + y^2 = r^2 and can't draw
> a circle at all.  :-)

You can get pretty damn close using that very formula and a little
bit of algebra. It's basically what they are told to do when they
are asked to plot this curve on paper (i.e. plug in a few numbers
and sketch it).

to circle :radius
pu
for [x -:radius :radius 1] ~
  [
  make "y sqrt ((:radius * :radius) - (:x * :x))
  setxy :x  :y pd fd 1 bk 1 pu
  setxy :x -:y pd fd 1 bk 1 pu
  ]
end

-- 
===============================================================
George Mills
email: mills@softronix.com
http://www.softronix.com
The www page contains some very powerful educational software.
Our single most important investment is our kids.
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