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Key Stage 1 (Lower Primary)
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1.3 Shape & Space 圖形與空間
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Quadrilaterals 四邊形
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2S4.3 方格紙上畫四邊形 Drawing Quadrilaterals on the Grid or the Pinboard
中文版：
http://www.geogebratube.org/material/show/id/20494
相關工作紙及教育局「網上學與教支援」資源（中文版）
Eng version:
http://www.geogebratube.org/material/show/id/22222
