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Songlang
GeoGebra
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中华人民共和国国旗
平行線的判定
正方形雪花图案
盈利與虧蝕
折扣
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圓周角與弦切角
托勒密定理推廣到任意四邊形一
DSE Circle-ACT01D Distance of Chords and Centre of a Circle
轉盤送分遊戲
各種五邊形
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Arithmetic Operations
Rectangle
Parabola
Angles
Means