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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
New Resources
畫出對稱圖形
兩位數除以一位數（一）
兩位數加法
異分母分數減法
兩組對邊相等和有直角的四邊形
Discover Resources
給定適當的折射率，模擬G點看到的物體成像
前景背景
平移旋轉
Gradient of tangent
星形线-Astroid Curve-with-Envelope Command
Discover Topics
Reflection
Logarithmic Functions
Integers
Trigonometry
Set Theory