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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
兩組對邊相等的四邊形
兩位數除以一位數（一）
拼砌四邊形
算柱 (兩位數)
判斷球體
Discover Resources
平行四邊形變奏II
Quiz on Angles in a Circle 圓內的角：測驗
比較圖形大小3
有高低起伏的滾球平台
游戏
Discover Topics
Rotation
Algebra
Triangles
Polygons
Prism