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Author:
李政憲
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
異分母分數減法
三位數除以一位數（二）
球體建築師
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三角函數with sine, cosine圖形
數學傳播39卷4期, 平面幾何公式思考
切割正二十面體
正十二面體裁邊 (Chamfered Dodecahedron)
动圆与两圆外切与内切(2)
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Similar Triangles
Multiplication
Indefinite Integral
Coordinates
Polygons