Maths problem: how to do (d), thanks, i just want to guide me how to do.?
回答 (2)
2020-04-27 9:45 pm
✔ 最佳答案
i) From rt.-∠ed ΔABE,AE² = BE²+(8+10)²
∴ AE = .....
ii) ∠ECF = 40⁰ { from (a)
∴ In ΔCEF, ∠C=∠F=40⁰
=> ΔCEF is an isos.Δ
=> EF=EC= .... { from (c)
From i) & ii) :
∴ AF=AE-EF= ....
2020-04-27 9:32 pm
△ADF 三個角分別是 10°, 40°, 130°.
AD/sin(40°) = AF/sin(130°) = DF/sin(10°)
AD = 8 已知, 則 AF, DF 亦可知.
AD/sin(40°) = AF/sin(130°) = DF/sin(10°)
AD = 8 已知, 則 AF, DF 亦可知.
收錄日期: 2021-04-24 07:58:02
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https://hk.answers.yahoo.com/question/index?qid=20200427125503AAmaasD