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餘角
Author:
賴鍵維
GeoGebra
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兩組對邊相等的四邊形
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
球体的体积推导
兩組對邊相等和有直角的四邊形
Discover Resources
三心：與三角形形狀的關係
ex 9
Drag the red dots, see the area ratio of EHFG to ABCD
PROBLEM SOLVING(COLOUR)
固定周界的長方形的面積變化（周界是200厘米）
Discover Topics
Quadratic Equations
Optimization Problems
Vectors
Fractal Geometry
Hypothesis Testing