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Author:
Lin Ching Chieh
GeoGebra
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兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
錐體建築師
三位數除以一位數（二）
兩位數加法
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Ratio of angles at the centre and the length of the arcs.
滾動的圓
探索三角形SAS全等性質
数学涂鸦
单位圆画三角函数图像 李艾心
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Combinatorics
Frequency Distribution
Straight Lines
Percentages
Rotation