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平行線法
Author:
chen mingchuan
GeoGebra
New Resources
長方體平面投影 (Codex版)
拼砌四邊形
Nested spiral octagon
美國國旗 (Claude 版)
兩組對邊相等和有直角的四邊形
Discover Resources
Orthocentre
GeoGebra Book
长方形边线展开
小正多边形在大正多边形内的滚动（边长相等）
探究三角形的全等條件
Discover Topics
Curve Sketching
Surface
Definite Integral
Scatter Plot
Area