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Clock
Author:
Tsang Kin Fun Francis
You can move the hands freely on the clock ...
GeoGebra
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四邊形的特性
算柱 (兩位數)
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
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數列與級數
認識一次函數關係式與圖形
一組物件的幾分之幾（練習）
定值角度
祖暅之《綴術》：「緣冪勢既同，則積不容異。」
向外延伸的多邊形
Discover Topics
Curve Sketching
Multiplication
Rhombus
Scalene Triangles
Special Points