125.6÷3.14÷2
=40÷2
=20(厘米)
20-8=12(厘米)
答:钢管内圆半径为12厘米.
故选:A.
一根钢管的外圆周长是125.6厘米,管壁厚8厘米,钢管内圆半径是( )厘米. A.12 B.16 C.24 D.32
一根钢管的外圆周长是125.6厘米,管壁厚8厘米,钢管内圆半径是( )厘米.
A. 12
B. 16
C. 24
D. 32
A. 12
B. 16
C. 24
D. 32
数学人气:745 ℃时间:2020-03-28 09:02:10
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