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ID:62155725
大小:2.42 MB
页数:66页
时间:2021-04-19
《最新确定起跑线课件PPT.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、确定起跑线计算下图的周长。15m10m一、情景引入100米比赛运动员起跑情形400米比赛运动员起跑情形二、合作探究内外跑道长度的差异是怎样形成的?二、合作探究内外跑道长度的差异是怎样形成的?是因为内圆和外圆的周长不一样。二、合作探究怎样找出相邻两个跑道的长度之差?132终点线85.96m72.6m1.25m1.25m1.25m85.96m72.6m1.25m1.25m1.25m注:π取3.1415985.96m72.6m第一道直径:周长:全长:72.6m72.6×3.14159≈228.08(m)85.96×2+228.08=400(m)72.6228.08400注:π
2、取3.1415985.96m72.6m第一道直径:周长:全长:72.6m228.08m400m第二道直径:周长:全长:72.6+1.25+1.25=75.1(m)75.1×3.14159≈235.93(m)85.96×2+235.93=407.85(m)1.25m1.25m72.6228.0840075.1235.93407.85注:π取3.1415985.96m72.6m第二道直径:周长:全长:75.1m235.93m407.85m第三道直径:周长:全长:75.1+1.25+1.25=77.6(m)77.6×3.14159≈243.79(m)85.96×2+243.79=
3、415.71(m)1.25m1.25m75.1m72.6228.0840075.1235.93407.8577.6243.79415.71注:π取3.1415985.96m72.6m第三道直径:周长:全长:77.6m243.79m415.71m第四道直径:周长:全长:77.6+1.25+1.25=80.1(m)80.1×3.14159≈251.64(m)85.96×2+251.64=423.56(m)1.25m1.25m77.6m72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.56注:π取3.141598
4、5.96m72.6m第四道直径:周长:全长:80.1m251.64m423.56m第五道直径:周长:全长:80.1+1.25+1.25=82.6(m)82.6×3.14159≈259.50(m)85.96×2+259.5=431.42(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.5682.6259.5431.42注:π取3.1415985.96m72.6m第五道直径:周长:全长:82.6m259.5m431.42m第六道直径:周长:全长:82.6+1.25+1.25=85.1(m)85.1×3.1
5、4159≈267.35(m)85.96×2+267.35=439.27(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.5682.6259.5431.4285.1267.35439.27注:π取3.1415985.96m72.6m第六道直径:周长:全长:85.1m267.35m439.27m第七道直径:周长:全长:85.1+1.25+1.25=87.6(m)87.6×3.14159≈275.20(m)85.96×2+275.2=447.12(m)72.6228.0840075.1235.93407.8
6、577.6243.79415.7180.1251.64423.5682.6259.5431.4285.1267.35439.2787.6275.2447.12注:π取3.1415985.96m72.6m第七道直径:周长:全长:87.6m275.2m447.12m第八道直径:周长:全长:87.6+1.25+1.25=90.1(m)90.1×3.14159≈283.06(m)85.96×2+283.06=454.98(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.5682.6259.5431.4285.
7、1267.35439.2787.6275.2447.1290.1283.06454.98注:π取3.14159各跑道的起跑线应该相差多少米?72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.5682.6259.5431.4285.1267.35439.2787.6275.2447.1290.1283.06454.98注:π取3.14159各跑道的起跑线应该相差多少米?7.85m/7.86m7.857.867.857.867.857.857.86我不
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