Math Foundations/A/4

31. Parallelograms and affine combinations
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32. Geometry in primary school
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33. What exactly is an area?
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34. Area of polygons
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35. Translations, rotations and reflections (I)
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36. Translations, rotations and reflections (II)
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37. Translations, rotations and reflections (III)
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38. Why angles don't really work (I)
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39. Why angles don't really work (II)
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40. Correctness in geometrical problem solving
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Continued in Math Foundations/A/5