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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
畫出對稱圖形
算柱 (兩位數)
判斷球體
近似值：有效數字
Discover Resources
Linear Inequalities in Two Unknowns 二元一次不等式
Tracing the Cosine Graph
第三冊2-2練習11
正十二面體裁邊 (Chamfered Dodecahedron)
表内乘法
Discover Topics
Straight Lines
Trapezoid
Correlation
Vectors 3D (Three-Dimensional)
Integral Calculus