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Ch 12 Angles related to straight lines
Author:
lamanleung
GeoGebra
New Resources
画直线等分三角形的面积
第八周作业
三位數除以一位數（二）
畫出對稱圖形
四邉形 (四年級) 教師版
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Summary
根據百分率找數量（二）: 例4的副本
任意凸多边形的滚动
S3 Ch4.3 例4.6b 三視圖(3D圖)
展開圓面積 (講義版)的副本
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Orthocenter
Logarithmic Functions
Percentages
Sphere
Optimization Problems