设内圆半径为r,则外圆半径为r+2,
内圆周长为:3.14×2r=6.28r,
外圆周长为:3.14×2(r+2)
=6.28(r+2),
=6.28r+12.56,
外圆周长比内圆周长多:6.28r+12.56-6.28r=12.56(厘米),
答:环形外圆周长比内圆周长多12.56厘米.
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