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GeoGebra
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双心四边形
比較五件物件的重量
龙形曲线-分形龙
圓的基本性質
活动三：应用性质
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正九邊形
總結
五角星动画
F3 Ch9.3 羅盤及真方位角
动圆与两圆外切与内切(2)
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Symmetry
Calculus
Vectors
Straight Lines
Integral Calculus