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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,100,米决赛运动员起跑情形,400,米决赛运动员起跑情形,每一条跑道的长度两个直道的长度圆的周长,每一条跑道的长度两个直道的长度圆的周长,72.6,米,1.25,米,1,号,2,号,(,长度相等,),每一条跑道的长度两个直道的长度圆的周长,72.6,米,1.25,米,1,号,2,号,(,长度相等,),1.25,米,1,2,3,4,5,6,7,8,直径(,m,),72.6,75.1,周长(,m,),228.08,235.93,全长(,m,),400,407.85,相差(,m),72.6,米,1.25,米,1,2,3,4,5,6,7,8,直径(,m,),72.6,75.1,周长(,m,),228.08,235.93,全长(,m,),400,407.85,相差(,m),72.6,米,1.25,米,表示两个半圆形跑道的周长:,3.1415972.6,228.08m,表示两个半圆形跑道的周长以及两条直跑道的全长,228.08,85.962,400m,1,2,3,4,5,6,7,8,直径(,m,),72.6,75.1,周长(,m,),228.08,235.93,全长(,m,),400,407.85,相差(,m),72.6,米,1.25,米,7.85,235.93,228.08,7.85M,407.85,400,7.85M,1,2,3,4,5,6,7,8,直径(,m,),72.6,75.1,周长(,m,),228.08,235.93,全长(,m,),400,407.85,相差(,m),72.6,米,1.25,米,7.85,235.93,228.08,7.85m,407.85,400,7.85m,1,2,3,4,5,6,7,8,直径(,m,),72.6,75.1,周长(,m,),228.08,235.93,全长(,m,),400,407.85,415.7,相差(,m),7.85,72.6,米,1.25,米,77.6,243.78,7.85,1,2,3,4,5,6,7,8,直径(,m,),72.6,75.1,77.6,80.1,82.6,85.1,87.6,90.1,周长(,m,),228.08,235.93,243.78,251.63,259.48,267.33,275.18,283.03,全长(,m,),400,407.85,415.7,423.55,431.4,439.25,447.1,454.95,相差(,m),7.85,7.85,7.85,7.85,7.85,7.85,7.85,72.6,米,1.25,米,72.6,米,1.25,米,(,72.6+1.252,),3.14,72.63.14,75.13.14,72.63.14,7.85,(,m,),(,75.1+1.252,),3.14,75.13.14,7.85,(,m,),72.6,米,1.25,米,(,72.6+1.252,),3.14,72.63.14,75.13.14,72.63.14,7.85,(,m,),(,75.1+1.252,),3.14,75.13.14,7.85,(,m,),如果我们在计算圆的周长时直接用,来表示,看你有什么发现?,确定起跑线,每一条跑道的长度两个直道的长度圆的周长,(,72.6,1.252,),72.6,(,75.1,1.252,),75.1,72.6,72.6,1.252,75.1,75.1,1.252,1.252,1.252,400,米跑相邻跑道相差:跑道宽,2,巩固练习、实践应用:,1,、,400,米的跑步比赛,跑道宽为,1.5,米,起跑线 该依次提前多少米?如果跑道宽是,1.1,米呢?,2,、在运动场上还有,200,米的比赛,跑道宽为,1.25,米,起跑线又该依次提前多少米?,1.523.14,9.42,(,m,),1.123.14,6.908,(,m),1.2523.14,2,1.253.14,3.925,(,m,),
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