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-1/8 ≤ cosα cosβ cosγ ≤ 1
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
四邊形的特性
【案例】2013年安徽高考15题
畫出對稱圖形
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鑲嵌圖形-1
利用對摺找內心
sghf
圓錐切球
v型咖啡濾網
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Dilation
Translation
Ratios
Square
Right Triangles