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定周长的正多边形面积变化规律（含圆）
Author:
张英华
Topic:
Area
GeoGebra
New Resources
Nested spiral octagon
拼砌四邊形
判斷球體
Fibonacci Clock
小数 的副本
Discover Resources
了解圓方程(2)
餘弦定理
動國旗
gltyz 斜圓錐
正方体展开图的副本
Discover Topics
Sequences and Series
Boxplot
Polygons
Parallelogram
Combinatorics