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滾動展開多邊形
Author:
陳隆期
GeoGebra
New Resources
算柱 (兩位數)
四邉形 (四年級) 教師版
兩位數除以一位數（一）
球體建築師
兩位數加法
Discover Resources
平面與正立方體的截痕
角平分線性質
圓周角與圓心角的關係
讀磅 (練習)
正弦线与直线
Discover Topics
Matrices
Line Segment
Bar Chart or Bar Graph
Median Line
Fractal Geometry