教育专题：确定起跑线 (2)

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,确定起跑线,第二道的长度,=2,个直段长度,+,第二道圆周长,跑道一圈的长度,=2,个直段长度,+,圆周长,第一道的直径为,72.6,米,1,2,3,4,5,6,7,8,直径,(m),72.6,周长,(m),全长,(m),3.14159,第一道的直径为,72.6,米,1,2,3,4,5,6,7,8,直径,(m),72.6,75.1,77.6,80.1,82.6,85.1,87.6,90.1,周长,(m),228.08,235.93,243.79,251.64,259.50,267.35,275.20,283.06,全长,(m),400,407.85,415.71,423.56,431.42,439.27,447.12,454.98,相邻起跑线相差都是,2.5,也就是道宽,2,3.14159,相邻起跑线相差：,2.5=2.5,3.14=7.85,米,400,米的跑步比赛，道宽为,1.5,米，起跑线该依次提前多少米？,