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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
球體建築師
【案例】2018年全国1卷理科12题
判斷球體
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
Discover Resources
Exploring the changes in mean and median
國中(1-1等線段作圖)
some circles
賺賠：例3的副本
高中二年級平面向量的副本
Discover Topics
Statistical Characteristics
Set Theory
Rhombus
Conditional Probability
Constructions