請列式
http://img202.imageshack.us/img202/9413/002cu.jpg
求圖形的周界?
2010-03-13 10:18 pm
回答 (2)
2010-03-13 10:40 pm
✔ 最佳答案
圖片參考：http://img202.imageshack.us/img202/9413/002cu.jpg
設左下方半圓的直徑 = x , 則右下方半圓的直徑 = 8 - x :
它們的周界之和 = 3.14 * x/2 + 3.14 * (8-x)/2
= 1.57x + 1.57(8-x)
= 1.57x + 1.57*8 - 1.57x
= 1.57 * 8
= 12.56cm
上方半圓周界 = 8 * 3.14 / 2 = 12.56cm
圖形的周界 = 12.56 + 12.56 = 25.12cm
2010-03-13 10:44 pm
設左下方半圓的直徑 = x , 則右下方半圓的直徑 = 8 - x :
它們的周界之和 = 3.14 * x/2 + 3.14 * (8-x)/2
= 1.57x + 1.57(8-x)
= 1.57x + 1.57*8 - 1.57x
= 1.57 * 8
= 12.56cm
上方半圓周界 = 8 * 3.14 / 2 = 12.56cm
圖形的周界 = 12.56 + 12.56 = 25.12cm
它們的周界之和 = 3.14 * x/2 + 3.14 * (8-x)/2
= 1.57x + 1.57(8-x)
= 1.57x + 1.57*8 - 1.57x
= 1.57 * 8
= 12.56cm
上方半圓周界 = 8 * 3.14 / 2 = 12.56cm
圖形的周界 = 12.56 + 12.56 = 25.12cm
參考: me
收錄日期: 2021-04-21 22:09:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100313000051KK00790