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Transit of Venus - Pentagram
Author:
Chenwei Chen
GeoGebra
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兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
球体的体积推导
判斷球體
兩位數除以一位數（一）
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Rotational Symmetry
四下_認識小數(學生版)
在釘點紙上畫垂直線
perimeter
根據百分率找數量（一）: 例4的副本
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Bar Chart or Bar Graph
Subtraction
Tree Diagrams
Cone
Equilateral Triangles