劉紹正2014-10-272014-10-272004-09-??http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/8870圓錐曲線尺規作圖幾何學圓錐曲線切線的尺規作圖The Constructions of Compass and Straightedge about Tangent Line of Conic Section