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竞猜游戏：说出图中角的大小
Author:
张志勇
Topic:
Angles
GeoGebra
New Resources
算柱 (兩位數)
柱體建築師
三位數除以一位數（二）
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
Discover Resources
隨機迷宮
Concept of Ratios 比的概念
正立方體截痕
和两个圆都相切的圆
直线边界磁场
Discover Topics
Trigonometry
Line Segment
Addition
Tangent Line or Tangent
Statistics