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【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
判斷球體
找出對稱軸
Opdag Ressourcer
吳老師幾何題
極線獨立定理 / polar independence theorem
Drag the red dots, see the area ratio of EHFG to ABCD
圓外切四邊形
Introduction to Rectangular Coordinates
Udforsk emner
Symmetri
Konfidensinterval
Rotation
Omkreds
Differentialregning