A small circle with the radius of I cm moves around a large circle with the diameter of 6 cm.How long does the small circle go?How many rounds does the small cicle move?
问题描述：
A small circle with the radius of I cm moves around a large circle with the diameter of 6 cm.
How long does the small circle go?How many rounds does the small cicle move?
答
半径为1cm 的小圆绕直径为6cm 的大圆滚动，问小圆滚动动的距离有多长，问小圆滚动了多少周才能滚完？
答
小圆绕大圆运动一周的距离等于大圆的周长=6π=18.84 cm
小圆绕大圆运动一周转过的圈数=6π/2π=3 圈