光盘的银色部分是一个圆环,内圆半径是2cm,外圆半径是6cm,它的面积是______cm2.
人气:494 ℃ 时间:2019-12-16 01:46:53
解答
3.14×(62-22),
=3.14×(36-4),
=3.14×32,
=100.48(平方厘米),
答:它的面积是100.48平方厘米.
故答案为:100.48.
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