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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
常见四边形是否是双心四边形
第三周作业效果演示
直線的斜率：水平變化 & 鉛垂變化
折扣
盈利與虧蝕
Discover Resources
底數小於1的指數變化
任兩正方形重組成一大正方形partII
S3 Percentages
Spiral Polyskelion
正N边形点列
Discover Topics
Mode
Tangent Line or Tangent
Reflection
Circle
Geometric Mean