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SWC introduce orthocentre
Author:
hksiusir
GeoGebra
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平行線的判定
活动三：应用性质
第八周作业
第八周作业3
撒针估算面积实验
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中一︰相似圖形（平移、旋轉、反射、放大縮小）
How tall is that?
DSE Circle-ACT01A Relationship between Chords and Centre of a Circle
练习及小结
構作對稱圖形_FK1
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Derivative
Isosceles Triangles
Numbers
Rotation
Mathematics