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Author:
Kook kin yip
GeoGebra
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比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
撒针估算面积实验
活动三：应用性质
双心四边形
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Proof77 - 楊筑雯
Apollonius Problem gergonne 4
P.8.20
transformation_enlarge/reduction
正方形與長方形
Discover Topics
Trigonometric Functions
Derivative
Right Triangles
Cube
Trigonometry