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congruent (ASA)
Author:
Ricky Chan
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
拼砌四邊形
算柱 (兩位數)
兩位數除以一位數（一）
Discover Resources
風車2
四下_四邊形(學生版)
旋梯
第一題
三角形重心、垂心、內心、外心、尤拉線、九點圓圖解
Discover Topics
Linear Programming or Linear Optimization
Geometry
Vectors 2D (Two-Dimensional)
Triangles
Hypothesis Testing