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內外角平分線
Author:
羅驥韡 (Pegasus Roe)
Topic:
Circle
角平分點（圖中 C 點）會形成一個圓
GeoGebra
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拼砌四邊形
畫出對稱圖形
柱體建築師
判斷球體
小数 的副本
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象形圖 (找出最多/最少)
vertex of quadratic function
滑桿動畫
橢圓1--同心圓法
分點與向量比
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Tree Diagrams
Logic
Intersection
Angles
Conic Sections