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數B第四冊P.25習題9
Author:
JUNWAYLIANG
GeoGebra
New Resources
多邊形的面積
双心四边形
龙形曲线-分形龙2
常见四边形是否是双心四边形
直線的斜率：水平變化 & 鉛垂變化
Discover Resources
Demonstration of the angles at the same segment
Circumcentre
Distributive Law of Multiplication 1 (乘法的分配率 1)
ETV 對稱
All in one (Centres of triangle)