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代數運算：外心座標
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
四邉形 (四年級) 教師版
三位數除以一位數（二）
兩組對邊相等的四邊形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
題 3
Angle in Alternate Segment 1
随机数表
拼砌四邊形
微分量 (Differentials)
Discover Topics
Multiplication
Histogram
Polygons
Parallelogram
Triangles