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两个正四面体
Author:
钟古思
GeoGebra
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盈利與虧蝕
平行線的判定
三角函数 的副本
斐波那契螺旋弧线（表格法-可动态调节）
直線的斜率：水平變化 & 鉛垂變化
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擺線
內切圓滾動更新
Quiz on Reflection 反射變換：測驗
柱體體積公式 - 六年級數學
Tangent perpendicular to radius
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Definite Integral
Sequences and Series
Linear Equations
Rectangle
Vectors 2D (Two-Dimensional)