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角的認識
Author:
whtong
GeoGebra
New Resources
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
sanjiaohanshu
兩組對邊相等的四邊形
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阿基米德(3,10,10)
圓錐曲線
三角形的底和高
数一数这是几边形
圆面积和周长展开示意图
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Area
Orthocenter
General Quadrilateral
Solids or 3D Shapes
Fractions