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Key Stage 3 (Junior Secondary)
>
3.2 Measures, Shape & Space 度量、圖形與空間
>
Angles Related with Lines and Rectilinear Figures 與線及直線圖形有關的角
>
多邊形內角和
http://www.geogebratube.org/material/show/id/30001
(
Download GeoGebra file
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