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11.1.1-Opposite Angles of a Cyclic Quadrilateral_eng

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11.4-內錯弓形的圓周角_chi

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11.3.2-由一外點引出的兩條切線_chi

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11.3.1-圓的切線的性質_chi

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11.2-圓內接四邊形的檢測_chi

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11.1.2-圓內接四邊形外角_chi

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11.1.1-圓內接四邊形對角_chi

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10.4.2-Proportion Relations between Angles and Arcs_eng

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10.4.1-Equal Relations among Angles, Arcs and Chords_eng

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