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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
四邊形的特性
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
拼砌四邊形
【案例】圆柱体内放置一个大球六个小球
Discover Resources
S5 geometry
Orthocentre
四下_面積（一）(教師版)
拋物線代數性質,光學性質
翰林數學_2下_CH4-1_截線與截角的意義
Discover Topics
Similarity Transformation or Similarity
Geometric Transformations
Linear Equations
Calculus
Interest Calculation