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Key Stage 3 (Junior Secondary)
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3.2 Measures, Shape & Space 度量、圖形與空間
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Simple Idea of Areas and Volumes 面積和體積的簡單概念
Area of Circles(1) 圓的面積(一)
Area of Circles(2) 圓的面積(二)
Area of Circles(3) 圓的面積(三)
Circumference of Circles 圓周與直徑的關係
Pick's Theorem
