Maths problem; how to do, thanks?
回答 (1)
2020-12-07 4:36 pm
(a)
∠FBC=60
∠ABF=90-60 =30
AB = BF (isosele triangle)
=> 2*∠AFB+30 = 180
∠AFB=75
(b)
∠BFC=60 => ∠BFE=120
∠AFE = 120-75 = 45
∠FBC=60
∠ABF=90-60 =30
AB = BF (isosele triangle)
=> 2*∠AFB+30 = 180
∠AFB=75
(b)
∠BFC=60 => ∠BFE=120
∠AFE = 120-75 = 45
收錄日期: 2021-04-24 08:05:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20201124122706AA4BrJn