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1  | 平分三边形之三边 于一二三作乙一丙 二甲三三中垂线相交于丁平分丁甲一 角作分角线遇丁一线于子以丁为心以丁子为度度于二三两线遇于丑与寅则丑子寅为所求之三圆心而子一为其半径若过 子点作线与甲丙边平行遇甲三丙二两 线于卯辰又自卯与辰各作线与甲乙乙丙两线平行则得又三圆心 |
| 2 | 有长椭圆体及 圆锥体椭圆短径等于锥之底径长径等于锥高此二体和即等径等高之 圆柱试解其理 |
| 3 | 蔡锡勇 |
URN: ctp:ws285844
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