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Centres in a Triangle(三角形的中心)
Author:
chisunch1
GeoGebra
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平行線的判定
直線的斜率：水平變化 & 鉛垂變化
撒针估算面积实验
活动三：应用性质
第八周作业1
Discover Resources
Symetry
雙曲線與斜率
解題四
小六 圓周
抛物面
Discover Topics
Similar Triangles
Circle
Means
Division
Planes