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利用单位圆生成y=sin（x）在[0,2pi]的图象
Author:
孙琰
GeoGebra
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百分數及其應用
盈利與虧蝕
科赫雪花
撒针估算面积实验
比較五件物件的重量
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以量角器量度角
圓周角與弦切角
分割三角柱
Compare areas by cutting shapes Q3
可拖动A、B 改变形状
Discover Topics
Perimeter
Algebra
Inequalities
Triangles
Statistical Characteristics