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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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兩位數除以一位數（二）
兩組對邊相等的四邊形
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
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折扣 例4
Proof35 高士哲
地球20160328
體積的量度 4
可調包絡圓
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Equilateral Triangles
Rhombus
Subtraction
Parallelogram
Curve Sketching