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GeoGebra
Interior & Exterior Angles of Triangles 三角形內角和及外角
Author:
Alex CHIK
點擊各角可顯示它們的大小。
GeoGebra 互動數學教室
http://www.geogebra.hk
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Exercise 1
geogebra 1st try
Ulikheter 2, 10E
rhombus
Triangle with Mid Segment
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