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同心圓
Author:
賴詩唐
GeoGebra
New Resources
多邊形的面積
圓的基本性質
直線的斜率
直線的斜率：水平變化 & 鉛垂變化
斜率的值
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sum of interior angle
增長的圓
極值問題
百度
半椭圆面积的定积分动态演示.许兴华数学
Discover Topics
Centroid or Barycenter
Cosine
Tree Diagrams
Natural Numbers
Optimization Problems