小6數學問題1:－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

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小6數學問題1

Jan 18th 2014, 06:33

數學問題：有一個圓形的池塘，用一條繩子繞6圈不足15.2公尺，如果繞4圈則剩餘173.2公尺，問這個圓形池塘的半徑是多少公尺？

圓形的圓周長=直徑*圓周率
依題意:

6*直徑*圓周率-15.2=4*直徑*圓周率+173.2

6*直徑*圓周率-4*直徑*圓周率=173.2+15.2

2*直徑*圓周率=188.4公尺

直徑*圓周率=188.4/2=94.2

圓周率=3.14

直徑=94.2/3.14=30

半徑=30/2=15

ans:半徑=15公尺

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