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小圓內繞大圓
Author:
rachmaninoff
GeoGebra
New Resources
算柱 (兩位數)
近似值：有效數字
畫出對稱圖形
sanjiaohanshu
直角坐標平面上的旋轉變換
Discover Resources
Measurement & Classification of Angles 角的量度和分類
比較分數大小
堆朵4邊形(試算表版)
三角形n邊形外角和
圓周角與圓心角之度數關係臆測（圓周角的一邊通過圓心）
Discover Topics
Area
Integers
Curve Sketching
Statistics
Reflection