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正多邊形各邊中點連線所圍成的圖形
Author:
Jimmy Ma
GeoGebra
New Resources
Nested spiral octagon
近似值：有效數字
找出對稱軸
長方體平面投影 (Codex版)
兩組對邊相等的四邊形
Discover Resources
scalar multiplication
雙曲線20160521
小四平面圖形學習單
包含除法（整數÷整數）
外心(劉虹圻 高二三26)
Discover Topics
Optimization Problems
Correlation
Mathematics
Coordinates
Bar Chart or Bar Graph