Copia di Area of Circles (3)

remake of Area of Circles (2) 圓的面積 [url]http://www.geogebratube.org/material/show/id/27562[/url] Thessaloniki (Macedonia-Greece) June 2014
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Danila —

 
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活动
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目标群组(年龄)
13 – 15
语言
English (United States)
 
 
 
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