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Author:
Keung
GeoGebra
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异形操场
正方形雪花图案
中华人民共和国国旗
双心四边形
第八周作业
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平行四邊形
圓錐
maths1
四邊形內部反射_長寬角度可調整
鉛筆畫圓
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Orthocenter
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