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直線平行與相交情況
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GEOGEBRA啟
GeoGebra
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圓的基本性質
三角函数 的副本
异形操场
第八周作业1
双心四边形
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全等三角形
Perpendicular lines
BkD_act15_05c
circle
Gazing Cow Problem (d)
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Geometry
Equations
Angles
Similar Triangles
Constructions