麻煩幫幫手呀~~
1.一弧的圓心角為135度，若半徑為10cm，求弧長？
「數學」-扇形弧長
2008-04-09 9:46 pm
回答 (3)
2008-04-09 11:29 pm
✔ 最佳答案
(10+10)(3.14)(135/360)= 20*3.14*(3/8)
= 62.83*(3/8)
= 23.56cm
參考: Mathematics For Tomorrow
2008-04-09 10:03 pm
圓周 = 2pr (p = 3.1416)
弧長=2p x 10 x (135/360) = 7.5p
弧長=2p x 10 x (135/360) = 7.5p
收錄日期: 2021-04-13 15:24:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080409000051KK00953