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Key Stage 4 (Senior Secondary)
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4.2 Measures, Shape & Space 度量、圖形與空間
Basic properties of circles 圓的基本性質
gMath: 圓的基本性質 Basic Properties of Circles
Converses of Theorems on Circle Properties
GeoGebraBook: Circle Geometry
Locus 軌跡
gMath: 軌跡 Loci
軌跡（教師版）
Upside Down?
Equations of straight lines and circles 直線與圓的方程
gMath: 直線方程 Equations of Straight Lines
gMath: 圓的方程 Equations of Circles
More about trigonometry 續三角
Defining Trigonometric Ratios
gMath: 續三角學 More about Trigonometry
gMath: 續三角學的應用 More about Applications of Trigonometry
Trigonometric Graphs and the Unit Circle
Six Trigonometric Graphs and the Unit Circle
