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| Nine Point Circle | |
| 作者姓名： | 林自新 |
| 摘 要： | The nine point circle is a geometrical concept that links some of a triangle'S parts that one would initially feel could not be interconnected. This circle was discovered by Charles Julien Brian- chon(1783-1864)and Jean Victor Poncelet(1788- 1867). |
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