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Author:
Lttcmooc
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
畫出對稱圖形
Discover Resources
哈里斯螺旋 (Harriss Spiral)
模擬3D物件
分數與小數
硬幣繞多邊形面積
百分數：折扣 / 賺賠
等比数列前n项和公式
Discover Topics
Intersection
Centroid or Barycenter
Indefinite Integral
General Quadrilateral
Arithmetic