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Key Stage 3 (Junior Secondary)‎ > ‎3.2 Measures, Shape & Space 度量、圖形與空間‎ > ‎Simple Idea of Areas and Volumes 面積和體積的簡單概念‎ > ‎

Area of Circles(3) 圓的面積(三)

http://www.geogebratube.org/material/show/id/39699 (Download GeoGebra file)
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