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Author:
Chenwei Chen
GeoGebra
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常见四边形是否是双心四边形
圓的基本性質
平行線的判定
撒针估算面积实验
中华人民共和国国旗
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Problem 1
Different Forms of Quadratic Functions 二次函數的不同形式
杯麵
幾何塗色
Copy of 銳角三角：sin, cos
Discover Topics
Rotation
Line Segment
Sine
Upper and Lower Sum or Riemann Sum
Sequences and Series