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與三個半圓相切之圓家封閉面積
Author:
張道民
GeoGebra
New Resources
判斷球體
兩位數加法
兩位數除以一位數（一）
兩組對邊相等的四邊形
找出對稱軸
Discover Resources
物件的平移概念
等分例子
定周长的正多边形面积变化规律（含圆）
圓周角觀察操作
奠基
Discover Topics
Volume
Inequalities
Ratios
Piecewise Functions
Optimization Problems