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pyramid
Author:
Wong Ka Leong
GeoGebra
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常见四边形是否是双心四边形
第八周作业1
圓的基本性質
第八周作业3
中华人民共和国国旗
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表示數線上的位置
正弦定理
Light reflected in hyperbola的副本
congruent triangle_provided by Mr Yeung Kar Chun
例题2（P点可拖动）
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Similar Triangles
Sphere
Orthocenter
Functions
Perimeter