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5.4-2 同角三角函数的基本关系
Author:
GeoGebra Institute of WuXi
GeoGebra
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撒针估算面积实验
平行線的斜率
探究三角形的全等條件
折扣
正方形雪花图案
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推移(x 方向)
蝴蝶定理證明2:綜合法
rotational symmetry_3
弦心距
例题2(P点可拖动)
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Root
Geometry
Ellipse
Quadrilaterals