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平行四邊形變奏曲III
Author:
周桂名
Topic:
Parallelogram
移動C點 在固定長度下觀察，平行四邊形角度的變化。 如果是菱形，又有何不同？
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第八周作业
中华人民共和国国旗
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双心四边形
异形操场
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