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旁心四邊形
Author:
JUNWAYLIANG
GeoGebra
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常见四边形是否是双心四边形
折扣
正方形雪花图案
第八周作业2
斐波那契螺旋弧线（表格法）
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test
Tangent perpendicular to radius
同心六邊形
单晨答重庆李琳
三角形全等的直观图(可重合).许兴华数学
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Distributions
Limits
Reflection
Line Segment
Rotation