? 發問時間: 科學及數學數學 · 2 個月前

Maths problem; how to do, thanks?

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1 個解答

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  • 1 個月前

    (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

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