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Parallelogram 02 - testing
Author:
iedc
GeoGebra
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兩組對邊相等和有直角的四邊形
柱體建築師
畫出對稱圖形
異分母分數減法
四邊形的特性
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真方位角與羅盤方位角
六年級_截面_錐體_多邊形
八邊形碎形
杨辉三角
抛物线动态（不一样的做法）
Discover Topics
Cylinder
Trigonometry
Matrices
Difference and Slope
Coordinates