Recently, i got a lot of fun going through the examples of turtle

geometry in Abelson & Di Sessa original book.

(As already stated in previous thread by me)

Also, i started translating from logo to python all the examples in

the first chapter.

I am over the third paragraph at the moment.

If anyone is interested in receiving the first whole bunch of these

nice codes, just tell me.

Now, i have a geometric question about what the authors write:

in sec 1.1.2 they say that the following logo code:

TO ARCR R DEG

REPEAT DEG

FORWARD R

RIGHT 1

produce a circular arc as output, having "DEG" degrees and "R" radius;

and that it's true, actually;

if DEG = 180 the arc is a semicircumference and so on...

But, the "R" in the code is the single step forward the turtle does in

its path so i can't understand how this R can be seen as the radius of

the circular arc.

Any hint is very appreciated.

--

roberto

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