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圓周 (圖形D)
Author:
Keith Ko
移動右圖中的紅線到左方虛線，就知道它是相等於左圖的哪條線。
GeoGebra
New Resources
Earth with coastline
Nested spiral octagon
近似值：有效數字
兩組對邊相等和有直角的四邊形
美國國旗 (Codex 版)
Discover Resources
[問題] OP 最大投影長
基測數學100-1-30 等腰三角形的角度
Quadratic Inequalites(ax^2+bx+c)
對稱圖形
初中几何证明
Discover Topics
Derivative
Arithmetic Mean
Square
Equations
Scalene Triangles