On Thu, Sep 16, 2010 at 1:46 PM, roberto <robert...@gmail.com> wrote:
> 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. > Going forward 1 pixel and then turning 1 degree (and then repeating 360 times) gives you as close to a circle as you can get on the screen. If you were go to forward 2 pixels, the circle will be less smooth, but the radius will be twice the size... and so on... HTH, Vern -- > roberto > _______________________________________________ > Edu-sig mailing list > Edu-sig@python.org > http://mail.python.org/mailman/listinfo/edu-sig > > -- This time for sure! -Bullwinkle J. Moose ----------------------------- Vern Ceder, Director of Technology Canterbury School, 3210 Smith Road, Ft Wayne, IN 46804 vce...@canterburyschool.org; 260-436-0746; FAX: 260-436-5137 The Quick Python Book, 2nd Ed - http://bit.ly/bRsWDW
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