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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
兩組對邊相等的四邊形
球體建築師
找出對稱軸
拼砌四邊形
錐體建築師
Discover Resources
拋物線與弦相交的弓形區域
二年級_柱體的觀察
不可能系列-滾球
串珠(兩種顏色)
椭圆的定义
Discover Topics
Trapezoid
Geometric Mean
Ellipse
Secant Line or Secant
Circumcircle or Circumscribed Circle