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Perpendicular lines
Author:
Ng KC
GeoGebra
New Resources
四邊形的特性
兩位數加法
錐體建築師
三位數除以一位數（二）
兩位數除以一位數（二）
Discover Resources
構成三角形的邊長條件
面積3轉正三角形
Ex5D#5
旋轉方形
夾擠定理 (The Squeeze Theorem)
Discover Topics
Right Triangles
Surface
Parametric Curves
Scalene Triangles
Random Variables