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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
判斷球體
球體建築師
Discover Resources
龍騰4習作
Trajectory of system: y'=sin(y)-y/2
碎形
QQ空间
巧克力包裝盒的夾角(三角形柱)
Discover Topics
Quadrilaterals
Frequency Distribution
Standard Deviation
Circle
Secant Line or Secant