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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‎ > ‎

Circumference of Circles 圓周與直徑的關係

http://www.geogebratube.org/material/show/id/8222 (Download GeoGebra file)

http://www.geogebratube.org/material/show/id/111357 (Download GeoGebra file)
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