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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
異分母分數減法
第八周作业
算柱 (兩位數)
畫出對稱圖形
兩組對邊相等和有直角的四邊形
Discover Resources
Simultaneous Linear Equations 聯立二元一次方程
Trajectory of system: y'=y^2-y
垂直線的斜率_hui sir
勝者即正義
Linking dots (Function)
Discover Topics
Frequency Distribution
Polygons
General Quadrilateral
Arithmetic
Centroid or Barycenter