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範例：畫圈圈的筆
Author:
羅驥韡 (Pegasus Roe)
範例：畫圈圈的筆
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
探究三角形的全等條件
圓的基本性質
双心四边形
直線的斜率：水平變化 & 鉛垂變化
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賺賠：例1
How to reconstruct a quadrilateral farm to a triangular one with the same area?
過點切圓的動圓圓心軌跡
Dilate 習作
圆锥截面为圆椭圆双曲线抛物线的动画显示.许兴华数学
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Ellipse
Continuity
Intersection
Probability
Logic