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教学素材：离心率相同的双曲线
Author:
清风拂琴，陌上花开
GeoGebra
New Resources
圓的基本性質
多邊形的面積
撒针估算面积实验
直線的斜率：水平變化 & 鉛垂變化
讀磅
Discover Resources
圓與三角形中點的軌跡
扇形柱(調整底面圓的分割數，柱高)
小学奥数
gitfh 複合圖形-正四角柱中挖圓柱
Orthocentre
Discover Topics
Pyramid
Optimization Problems
Derivative
LCM and GCD
Geometric Transformations