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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
Earth with coastline
四邉形 (四年級) 教師版
AI 訓練教室
Nested spiral octagon
長方體平面投影 (Codex版)
Discover Resources
老皮
台灣國旗
四下_面積（一）(學生版)
量度身高
Gradient of tangent
Discover Topics
Scatter Plot
Distributions
Sequences and Series
Random Variables
Linear Regression