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扇形動畫
Author:
紀老師
GeoGebra
New Resources
兩位數除以一位數（一）
異分母分數減法
四邊形的特性
柱體建築師
拼砌四邊形
Discover Resources
公切線(配合Dilate指令)
Right-endpoint Riemann Sum
pic2-6一次函数的副本
構作對稱圖形
数一数
Discover Topics
Trapezoid
Circumcircle or Circumscribed Circle
Arithmetic Mean
Similar Triangles
Combinatorics