| Internet-based Lessons |
| Chen Family style Tai Chi Chuan - beginners |
| Tools - Tai Chi ruler - the underlying geometry |
| Rolling the circle inside another circle produces a curve named a hypocycloid |
| When the radii of the two circles are in 4:3 ratio the curve is called an astroid. |
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| See the astroid and its enclosing circle in the Gold Coin Spade below |
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| Back to the lesson |
| Prior geometry comment |
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