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Area of shapes
Author:
helenzhu1994
GeoGebra
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撒针估算面积实验
折扣
双心四边形
常见四边形是否是双心四边形
第三周作业效果演示
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Building Cones 建造圓錐體
弦切角是圓心角的一半
這好難用
堆朵
我的第一个GGB绘本
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Means
Piecewise Functions
Complex Numbers
Planes
Polygons