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Is this a prism 13
Author:
Shum Kwok Ching
GeoGebra
New Resources
兩位數除以一位數（一）
拼砌四邊形
異分母分數減法
找出對稱軸
兩組對邊相等的四邊形
Discover Resources
proof ASA
消失的面積(一)
反演(Inversion)
Copy of 齊來製作對稱圖
中心投影、平行投影
Discover Topics
Mode
Indefinite Integral
Equilateral Triangles
Perimeter
LCM and GCD