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howard45123512
GeoGebra
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錐體建築師
第八周作业
判斷球體
球体的体积推导（优化版）
球體建築師
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正立方體
Angle Between Two Planes Definition 平面與平面間之交角 定義
Angle of elevation and Angle of depression(仰角和俯角)
商高定理\水2的副本
小五_多邊形面積01
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Diagrams
Right Triangles
Calculus
Multiplication
Set Theory