339确定起跑线

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1、确定起跑线马郎小学陈伟人教版六年级数学上册第四单元132终点线85.96m72.6m1.25m1.25m1.25m85.96m72.6m1.25m1.25m1.25m12345678直径(m)周长(m)全长(m)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）12345678直径(m)周长(m)全长(m)72.6228.08400注：π取3.1415985.96m72.6m第一道直径：周长：全长：72

2、.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）1.25m1.25m12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.85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.

3、79（m）85.96×2＋243.79=415.71（m）1.25m1.25m75.1m12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.8577.6243.79415.71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）1.25m1.25m77.6m

4、12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.56注：π取3.1415985.96m72.6m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）12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.

5、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）85.1×3.14159≈267.35（m）85.96×2＋267.35=439.27（m）12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.12

6、51.64423.5682.6259.5431.4285.1267.35439.27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）12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.5682

7、.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）12345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.8577.6243.79415.7180.1251.64423.56

8、82.6259.5431.4285.1267.35439.2787.6275.2447.1290.1283.06454.98注：π取3.14159各跑道的起跑线应该相差多少米？7.85m/7.86m7.857.867.857.867.857.857.8612345678直径(m)周长(m)全长(m)72.6228.0840075.1235.93407.857