外圆面积
=28.26+50.24
=78.5平方厘米
3.14×外圆半径²=78.5
外圆半径=5厘米
外圆周长=2×3.14×5=31.4厘米以后有问题我就问你行不???没问题,晚上我一般都在线。 只要这样求助我即可。谢谢3χ﹣25%χ=93.5方程解不好意思 ,我不回答追问的新问题。还有问题,请先采纳我本题的答案,再另外向我求助,答题不易,请谅解!!!哦
一个圆环内圆面积为28.26cm²,外圆面积比内圆面积大50.24cm².外圆周长是多少?
一个圆环内圆面积为28.26cm²,外圆面积比内圆面积大50.24cm².外圆周长是多少?
数学人气:570 ℃时间:2019-10-23 04:12:53
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