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?

mandy

2015-08-29 4:57 pm

回答 (1)

用戶2053

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

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