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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
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兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（一）
四邉形 (四年級) 教師版
兩位數加法
Discover Resources
環形面積
Construct a regular pentagon
Simultaneous Linear Equations 聯立二元一次方程
包絡線：橢圓
Copy of 阿波羅尼斯圓
Discover Topics
Straight Lines
Vectors 2D (Two-Dimensional)
Prism
Right Triangles
Trigonometric Functions