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Apollonius Problem 4 LLP Power 12
Author:
tkyggb
GeoGebra
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常见四边形是否是双心四边形
双心四边形
直線的斜率：水平變化 & 鉛垂變化
垂直線的斜率
圓的基本性質
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K9@cn
正n星角
圖H
學習單：三角形內(外)角合
展開圓面積 (講義版)的副本
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Symmetry
Terms
Reflection
Equilateral Triangles
Arithmetic Mean