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垂心的動畫
Author:
黃國斌
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算柱 (兩位數)
兩組對邊相等和有直角的四邊形
長方體平面投影 (Codex版)
判斷球體
畫出對稱圖形
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平行四邊形面積教材二
parallelogram
button
不可能系列-滾球
正十二面體裁邊 (Chamfered Dodecahedron)
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Congruence
Sequences and Series
Logarithmic Functions
Plane Figures or Shapes
Root