底面积是:100.48÷2=50.24(平方厘米),
50.24÷3.14=16,
因为4×4=16,
所以圆柱的底面半径是4厘米;
9分米=90厘米,
50.24×2+3.14×4×2×90,
=100.48+2260.8,
=2361.28(平方厘米);
答:这根圆柱形的钢材原来的表面积是2361.28平方厘米.
把一根长9分米的圆柱形钢材,截成两段后,表面积比原来增加了100.48平方厘米,这根圆柱形的钢材原来的表面积是多少平方厘米?
把一根长9分米的圆柱形钢材,截成两段后,表面积比原来增加了100.48平方厘米,这根圆柱形的钢材原来的表面积是多少平方厘米?
数学人气:126 ℃时间:2020-04-12 04:47:22
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