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銳角三角：tan
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
Fibonacci Clock
直角坐標平面上的旋轉變換
算柱 (兩位數)
近似值：有效數字
兩組對邊相等和有直角的四邊形
Discover Resources
函數
三角形外心-性質說明
判斷柱體 9
gjh-e01-02 未知數邊長的長方形
No.3
Discover Topics
Similar Triangles
Rotation
Definite Integral
Special Points
Percentages