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垂心軌跡
Author:
黃國斌
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
錐體建築師
兩組對邊相等的四邊形
判斷球體
Discover Resources
平行1
square & Triangle
線性規劃
斜坐標
盈利與虧蝕
Discover Topics
Trapezoid
Mathematics
Secant Line or Secant
Linear Equations
Prism