一个圆柱的底面直径是 10cm,高是 15cm,它的侧面展开图的周长是_____cm
正确答案及解析
正确答案
92.8
解析
解:(3.14×10+15)×2 =(31.4+15)×2 =46.4×2,
=92.8(cm);
答:它的侧面展开图的周长是 92.8cm
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