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勾股定理折叠问题
Author:
数豆豆
GeoGebra
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双心四边形
祖冲之的期望：内棋与外棋
圓的切線方程
圓的基本性質
常见四边形是否是双心四边形
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十字交乘法
zuiduan
四邊形內多個四邊型旋轉
拼出三角形
鏡射的副本
Discover Topics
Step Functions
Coordinates
Quadratic Functions
Random Experiments
Real Numbers