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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
判斷球體
兩組對邊相等和有直角的四邊形
四邊形的特性
第八周作业
小数 的副本
Discover Resources
天干與地支
我的测试
电子表格建点
illusion 鏡射
三角錐(旋轉，實體、透視)
Discover Topics
Sphere
Coordinates
Unit Circle
Probability
Polygons