[Edu-sig] python fun geometry

[Daniel Ajoy]

> 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.


It is true that R specifies the radius of the arc, but it is not a measure of the radius of the arc:

If R is small the arc will have a small radius
If R is larger the arc will have a larger radius

But R is not the length of that radius.

Daniel