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START: a tidal line (#52); mentally locate center of line |
ACTION: break at center; each half rotates 90° to face center |
END: facing 4-lines, centered as shown |
last modified 12/25/2022 09:09:45 copyright 2004–2022 Dr. Carol JVF Burns | Powered by MathJax and JSXGraph | ![]() Please read my TERMS OF USE |