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58问答库 > 已知正八边形边长2.55米，求直径多少？请各位大神帮解一下

已知正八边形边长2.55米，求直径多少？请各位大神帮解一下

2025-04-07 03:42:11

推荐回答（3个）

回答（1）：

八边形内接一圆，圆的半径为：
R＝（2．55／2）／sin22.5
=1.275/0.383
=3.33
如正八边形外切一圆，圆的半径为：
R＝（2．55／2）／tan22.5
=1.275/0.414
=3.078

回答（2）：

回答（3）：

什么直径？说明白点，内切还是外接圆直径

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