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圖形的周界
Author:
samchan
,
Anthony OR 柯志明
GeoGebra
New Resources
探究三角形的全等條件
垂直線的斜率
讀磅
平行線的斜率
祖冲之的期望：内棋与外棋
Discover Resources
Plane
Triangle
橢圓軌跡05
歐幾米德多面體（四邊形與六邊形－進階加強版）
題 2