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圓外切四邊形（展示可推廣到凹多邊形）
Author:
Gideon Huang
Topic:
Geometry
GeoGebra
New Resources
盈利與虧蝕
圓的基本性質
祖冲之的期望：内棋与外棋
比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
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基本三角函數
冪函數
Multiplication of Polynomials 1(多項式的乘法 1)
劉虹圻 內心
求公切線段長
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Distributions
Coordinates
Random Variables
Definite Integral
Complex Numbers