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Opp angles cyclic quad
Author:
Big Lee
GeoGebra
New Resources
算柱 (兩位數)
兩位數加法
四邊形的特性
三位數除以一位數（二）
拼砌四邊形
Discover Resources
閱讀鐘面及數字鐘（時和分）
總結
Ex5C#5
P4面積
Multiplication of Directed Numbers
Discover Topics
Diagrams
Numbers
Logarithmic Functions
Sine
Algebra