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甚麼是球體
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GeoGebra
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【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
三位數除以一位數（一）
直角坐標平面上的旋轉變換
球體建築師
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正五角柱(可旋轉)
angle sum of polygon
Solving Triangles (Ambiguous SSA case)
圆柱侧面展开图
剪切成正三棱柱（制作：李三军，修订：孟宝兴）
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Geometry
Conic Sections
Unit Circle
Root
Planes