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蝴蝶定理證明2：綜合法
Author:
連琨銘
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
球体的体积推导（优化版）
画直线等分三角形的面积
四邉形 (四年級) 教師版
Discover Resources
angles sum of a triangle 1
Ext angle cyclic quad
平行四邊形堆垛
多点联动
不信你能過 1
Discover Topics
Cosine
Intersection
Cube
Similarity Transformation or Similarity
Vectors