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圓周 (圖形E)
Author:
Keith Ko
移動右圖中的紅線到左方虛線，就知道它是相等於左圖的哪條線。
GeoGebra
New Resources
兩位數加法
畫出對稱圖形
算柱 (兩位數)
四邉形 (四年級) 教師版
第八周作业
Discover Resources
標準差：測驗
雜類(Miscellaneous)
Elementary school math
異分母的分數加減
数学涂鸦
數線
Discover Topics
Differential Equation
Probability
Secant Line or Secant
Ratios
Subtraction