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正方形所夾三角形面積相等
Author:
vinnyya
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
球體建築師
找出對稱軸
四邊形的特性
球体的体积推导（优化版）
Discover Resources
阿基米德多面體 Archimedean Solid
Reflectional Symmetry 反射對稱
Key stage 1
串珠
黎曼和(Riemann Sum)
Discover Topics
Hypothesis Testing
Pie Chart or Circle Chart
Special Points
Subtraction
Area