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四边形外角和
Author:
陈宜红
Topic:
Geometry
GeoGebra
New Resources
折扣
双心四边形
撒针估算面积实验
圓的基本性質
比較五件物件的重量
Discover Resources
waaachen
telling the time
Torus
在三角形兩個邊各取一點使得三線段等長(BK=KL=CL)
SIN伸縮平移
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Means
Geometric Transformations
Derivative
Parallelogram
Arithmetic