�已知正三角形的边长为a，其内切圆的半径为r，外接圆的半径为r，r：a：r= ；�已知正方形的边长为a 百度知道 Sketch Coloring Page

�已知正三角形的边长为a，其内切圆的半径为r，外接圆的半径为r，r：a：r= ；�已知正方形的边长为a 百度知道 Template

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sketch #5037 Dolphin by Meen Suksoi

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sketch #215 my mickey mouse

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sketch #4287 eye

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sketch #5371 Senorita by Adrian Matosek

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sketch #3149 Dude with a sword by Elio Hernandez

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sketch #1551 donara

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sketch #1169 ENJOY IT!!!!!!!! OH NO EAT IT OR IT WILL MELT!!!!! :0

anonymous

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tomski�已知正三角形的边长为a，其内切圆的半径为r，外接圆的半径为r，r：a：r= ；�已知正方形的边长为a 百度知道 coloring

已知正三角形的边长为a求它的内切圆与外接圆所围成的圆环的面积．题目和参考答案——青夏教育精英家教�—— sketch template

若正三角形的边长为1在其外接圆半径为 内切圆半径为 ．题目和参考答案——青夏教育精英家教�—— sketch template

�已知正三角形的边长为a，其内切圆的半径为r，外接圆的半径为R，r：a：R= ；�已知正方形的边长为a 百度知道 sketch template

图1，正三角形ABC边长为3，以A为圆心，以2为半径 考研新东方在线 sketch template

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正三角形 Wikiwand sketch template

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百度教育 sketch template

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