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Learn01
Author:
June Guam
GeoGebra
三角形ABC，E、F分别是AB、AC的中点，通过E、F分别作垂线交于点D。 证明：AD＝BD。
New Resources
四邉形 (四年級) 教師版
sanjiaohanshu
畫出對稱圖形
Fibonacci Clock
找出對稱軸
Discover Resources
正方形的旋轉2
有趣的切圓
圖一
交換律
對稱圖形
Discover Topics
Interest Calculation
Piecewise Functions
Trigonometric Functions
Median Line
Cylinder