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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‎ > ‎

Angle Sum / Exterior Angles of Triangles

http://www.geogebratube.org/material/show/id/25639 (Download GeoGebra file)
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