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同心圓+等分割線
Author:
許清惟
GeoGebra
New Resources
直角坐標平面上的旋轉變換
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
畫出對稱圖形
異分母分數減法
Discover Resources
平行四邊形變奏II
GGB研習繪本
椭圆的定义的副本
梯形堆垛
建中科學班檢定
Discover Topics
Logic
Terms
Quadratic Equations
Cosine
Bar Chart or Bar Graph