一只大钟的时针长0.3米,这根时针的尖端1天走过多少米?扫过的面积是多少平方米?
问题描述:
一只大钟的时针长0.3米,这根时针的尖端1天走过多少米?扫过的面积是多少平方米?
答
(1)2×3.14×0.3×2,
=6.28×0.6,
=3.768(米);
(2)3.14×0.32×2,
=3.14×0.09×2,
=3.14×0.18,
=0.5652(平方米 ),
答:这根时针的尖端1天走过3.768米;扫过的面积是0.5652平方米.