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GeoGebra
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橢圓
Author:
洪宜慧
GeoGebra
New Resources
折扣
斐波那契螺旋弧线（表格法）
正方形雪花图案
撒针估算面积实验
常见四边形是否是双心四边形
Discover Resources
a slope triangle
軌跡方程式-重心軌跡
门禁系统
圓繞圓內外
拋物線的開口、對稱軸、頂點
Discover Topics
Tangent Line or Tangent
Sphere
Polygons
Pythagoras or Pythagorean Theorem
Pyramid