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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
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兩位數除以一位數(二)
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画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
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