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折三角形
Author:
王廷祐
GeoGebra
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椭圆内切圆链
撒针估算面积实验
异形操场
科赫雪花
正方形雪花图案
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Special Lines & Centres of Triangles 三角形的特殊線和中心
sum of interior angle
教學-直線方程性質
Example 6.1
等邊三角形
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Binomial Distribution
Real Numbers
Right Triangles
Trigonometry
Calculus