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切線斜率
Author:
sansam
GeoGebra
New Resources
双心四边形
圓周公式的應用
平行線的斜率
圓的基本性質
圓的切線方程
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平移
菱形
Copy of 梯形
S2 Angles Related to Rectilinear Figures
橢圓1--四圓心近似法