铁环周长为
3.808-0.04=3.768
直径=3.768/3.14=1.20
半径=1.20/2=0.60
面积=S=3.14*0.6*0.6=1.1304
把一根长3.808m的铁条弯成铁环,接头处4cm,铁环面积?
把一根长3.808m的铁条弯成铁环,接头处4cm,铁环面积?
其他人气：626 ℃时间：2020-04-01 17:08:23
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