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圖D
Author:
whtong
GeoGebra
New Resources
拼砌四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（一）
算柱 (兩位數)
畫出對稱圖形
Discover Resources
永遠垂直、以像素為單位的向量？
前景圖、背景圖
柱體建築師 3
證平行四邊形 (對角線互相平分) (對邊 // 且相等)
弓形的滚动
Discover Topics
Tree Diagrams
Isosceles Triangles
Arithmetic Operations
Triangles
Fractal Geometry