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元旦快乐（制作：孟宝兴）
Author:
孟宝兴
GeoGebra
New Resources
sanjiaohanshu
Nested spiral octagon
美國國旗 (Codex 版)
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
Discover Resources
Tracing the Cosine Graph
三圓相切
畢氏定理
定理介紹：切線性質 | Tangent Properties
平面向量基本定理
Discover Topics
Pyramid
Scatter Plot
Algebra
Circumcircle or Circumscribed Circle
Prism