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共垂心
Author:
Altmann Cho
GeoGebra
New Resources
柱體建築師
兩組對邊相等的四邊形
找出對稱軸
兩位數除以一位數（一）
判斷球體
Discover Resources
HKDSE 3D Figures
模擬3D物件
regular tetrahedron in a cube
螢橋國中 洪芷昀
比例中的定值問題(二)
少数派Pi
Discover Topics
Cosine
Plane Figures or Shapes
Similar Triangles
Incircle or Inscribed Circle
Sine