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厚會聚透鏡 Thick Convergent Lens
Author:
W.L. Wong, Albert
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
異分母分數減法
Discover Resources
畢氏定理動態證明(劉徽)
HKMO 2008 Question 3 Demonstration (Geometric Construction)
sinα + sinβ > 0 ?
正十二面體裁邊 (Chamfered Dodecahedron)
生日问题
Discover Topics
Parabola
Right Triangles
Fractions
Quadrilaterals
Division