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余弦定理
Author:
acchu
GeoGebra
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中华人民共和国国旗
科赫雪花
撒针估算面积实验
常见四边形是否是双心四边形
龙形曲线-分形龙
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Scheimpflug image
repetitive squares by excel
圓內兩半圓相切問題
面積
範例：丟骰子的副本
Discover Topics
Scalene Triangles
Symmetry
Circle
Algebra
Probability
