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Unit 3: Shapes - Khan Academy
Identifying transformations (video) | Khan Academy
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Angle types (practice) | Measuring angles | Khan Academy
Albert Eckhout, Series of eight figures (artykuł) | Khan Academy
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几何中的术语及标注 (视频) | Types of plane figures | 可汗学院
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Chapitre 3 : Les figures géométriques - Khan Academy