Three little circles

As we saw (and as you can check in the documentation of this world under "About this world"), turtles can only draw straight lines. Despite of this, the goal of this world is to draw circles... This can be achived simply by realizing that a circle can be seen as a concatenation of very little segments.

Differential calculus would even argue that a circle is the asymptotical limit of such construct when the size of each segment becomes infinitely small while their amount becomes infinitely large, but you can definitely solve this exercise without understanding differential calculus :)

Goal of this exercise

Write a function drawing a circle, taking the size of each of the 360 segments as parameter. Then use it in your code to draw the whole picture. The first circle is obtained with segments of size 0.5, the second with segments of size 1 and the last one with 1.5-long segments. Once again, this is a warming exercise, no recursion is needed.