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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
四邊形的特性
找出對稱軸
画直线等分三角形的面积
四邉形 (四年級) 教師版
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長方體
test
橢圓 推桿例題
探索三角形外角定理
Quiz on Solving One-step Linear Equations (1)
Discover Topics
Rectangle
Statistical Characteristics
Straight Lines
Confidence Interval
Cosine