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20190530 與平行線有關的角
Author:
Hui Sir
GeoGebra
New Resources
拼砌四邊形
判斷球體
柱體建築師
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
有向角
exp. functions
探索三角函数的图像
快看漫画
圓的基本性質
Discover Topics
Sequences and Series
Power Functions
Natural Numbers
Correlation
Similar Triangles