for q5, I don't understand why the ratio is 1:1? and for q6, just don;t know how to do as it is quite complicated i think?
回答 (1)
2015-08-29 11:03 pm
5a)
△AED : △DEC
= EA ED sin130° / 2 : EC ED sin50° / 2
= EA : EC
= 1 : 1
6)
h < BC < 12
12/√2 < a < 12
6√2 < a < 12
△AED : △DEC
= EA ED sin130° / 2 : EC ED sin50° / 2
= EA : EC
= 1 : 1
6)
h < BC < 12
12/√2 < a < 12
6√2 < a < 12
收錄日期: 2021-04-11 21:11:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150829085754AAo99Ly