This page draws spirograph like patterns using Javascript, choose a spot size by clicking on one of the spots or the associated text. (On a slow computer it will take a few seconds)
To work out the symmetry of the pattern;
- Take the 3 rates and find their highest common factor.
- Divide them all by this.
- Calculate the two differences (rate1 - rate2) and (rate2 - rate3).
- The highest common factor of these two differences is the rotational symmetry of the pattern.
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