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Sum of Interior Angles of Polygons 多邊形內角和
Author:
Alex CHIK
Topic:
Angles
,
Polygons
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
四邉形 (四年級) 教師版
三位數除以一位數（一）
三位數除以一位數（二）
異分母分數減法
兩位數除以一位數（二）
Discover Resources
線之極點定理 / pole of a line theorem
Calculus
教學－與直線有關的角
好多好多正方形
橢圓摺紙
Discover Topics
Statistical Characteristics
Prism
Dilation
Rotation
Cosine