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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
球体的体积推导（优化版）
【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
柱體建築師
Discover Resources
孔明棋 (Peg Solitare)
平行四邊形之變奏I
讚2
圓滾動
扇形滚动(圆心角半径可变)
Discover Topics
Upper and Lower Sum or Riemann Sum
Right Triangles
Combinatorics
Piecewise Functions
Limits