[幾何] 曲線，只知兩點與曲率半徑，求a、b、r?
假設現有一條曲線
是由兩點(x1,y1)、(x2,y2)構成
且知其曲率半徑為r
有辦法只以這些條件算出"圓心"以及"長軸"與"短軸"嗎?
若無法的話，請問缺少那些條件?
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