polygon patterns from rotation

Author:
Arthur Lee
Topic:
Rotation
You may create some pictures like the following. Have a try by adjusting the parameters. There are 3 sliders on the left, showing the values of n, d and t. Use the sliders to change the values or simply click to enter a particular value. How does each of them change the pattern? There are 3 movable control points A, B and Z. Point Z is hidden but can be revealed by clicking the check box. Use these control points to further vary the pattern. Have fun making the following patterns or creating your own.
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This video explains the construction.