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正n邊形與圓上點的中點軌跡
Author:
黃榆萍
GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
判斷球體
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Positive angles & Negative angles
Vector in R2
圖形周界_H
Quiz on Solving Quadratic Inequalities 解二次不等式：測驗 (v2018)
圓與弦2的副本
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Rectangle
Step Functions
Parallelogram
Mode
Integral Calculus