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厚會聚透鏡 Thick Convergent Lens
Author:
W.L. Wong, Albert
GeoGebra
New Resources
拼砌四邊形
畫出對稱圖形
異分母分數減法
【案例】2013年安徽高考15题
球体的体积推导（优化版）
Discover Resources
三角形三邊關係
方格紙上畫四邊形
Volume_Section
圓外冪性質
动点最值&旋转&椭圆模型
Discover Topics
Pythagoras or Pythagorean Theorem
Difference and Slope
Standard Deviation
Kite
Arithmetic Mean