http://i26.photobucket.com/albums/c124/ckmok/1111.jpg
abcd係個長方形+佢既area係30cm square.
find 周界of abcd
呢條數點計呀?(10marks)
2006-11-23 6:17 am
回答 (2)
2006-11-23 6:34 am
✔ 最佳答案
圖片參考：http://i26.photobucket.com/albums/c124/ckmok/1111.jpg
長方形abcd的面積是30cm2
求周界 abcd
設CD長x則
AC = 30/x
則
tan30 = AC/CD = (30/x) / x = 30 / x2
x2 = 30 / tan30
x = 7.21
AC = 30 / 7.21 = 4.16
所以周界為
2(AC + CD)
= 2(7.21 + 4.16)
= 22.74cm
2006-11-23 6:39 am
THE ANSWER IS 22cm
收錄日期: 2021-04-12 22:05:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061122000051KK04787