https://changzh.me/tags/%E8%A7%A3%E6%9E%90%E5%87%A0%E4%BD%95/Recent content in 解析几何 on Blog of BrianHugozh-CNSat, 19 Sep 2026 23:09:00 +0800https://changzh.me/posts/ellipse-to-circle-geometry/Sat, 19 Sep 2026 23:09:00 +0800https://changzh.me/posts/ellipse-to-circle-geometry/通过坐标伸缩把椭圆化为圆，推导切点坐标与一个弦长平方和恒等式，并说明哪些几何关系可以保留。