确定起跑线-PPT课件.ppt
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1、确定起跑线,复述回顾:,同桌互说直径、半径与圆周长的关系。计算下图的周长。,15m,10m,为什么运动员站在不同的起跑线?,设问导读:看书自学,1、跑道由()和()组成。2、左右两个半圆形的弯道合起来是()3、现在每一圈跑道的长度可以看成()。,两条直段跑道,一个圆,两个直道的长度加上一个圆的周长,两个半圆形跑道,小组合作:,观察每一条跑道的长度相等吗?怎样找出相邻两个跑道的差距?,相邻两跑道的长度差=外跑道的长度 相邻里跑道的长度,直道的长度是85.96米,第一条圆形的跑道的直径是72.6米,每条跑道宽1.25米,85.96m,72.6m,1.25m,1.25m,1.25m,注:取3.141
2、59,85.96m,72.6m,第一道,直径:,周长:,全长:,72.6m,72.63.14159228.08(m),85.962228.08=400(m),72.6,228.08,400,注:取3.14159,85.96m,72.6m,第一道,直径:,周长:,全长:,72.6m,228.08m,400m,第二道,直径:,周长:,全长:,72.61.251.25=75.1(m),75.13.14159235.93(m),85.962235.93=407.85(m),1.25m,1.25m,72.6,228.08,400,75.1,235.93,407.85,注:取3.14159,85.96m,
3、72.6m,第二道,直径:,周长:,全长:,75.1m,235.93m,407.85m,第三道,直径:,周长:,全长:,75.11.251.25=77.6(m),77.63.14159243.79(m),85.962243.79=415.71(m),1.25m,1.25m,75.1m,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,注:取3.14159,85.96m,72.6m,第三道,直径:,周长:,全长:,77.6m,243.79m,415.71m,第四道,直径:,周长:,全长:,77.61.251.25=80.1(m),80.1
4、3.14159251.64(m),85.962251.64=423.56(m),1.25m,1.25m,77.6m,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,注:取3.14159,85.96m,72.6m,第四道,直径:,周长:,全长:,80.1m,251.64m,423.56m,第五道,直径:,周长:,全长:,80.11.251.25=82.6(m),82.63.14159259.50(m),85.962259.5=431.42(m),72.6,228.08,400,75.1,235.93
5、,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,注:取3.14159,85.96m,72.6m,第五道,直径:,周长:,全长:,82.6m,259.5m,431.42m,第六道,直径:,周长:,全长:,82.61.251.25=85.1(m),85.13.14159267.35(m),85.962267.35=439.27(m),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.
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