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120 + <ABC = 180
<ABC = 180 - 120
<ABC = 60
<ABC + <BCA + <CAB = 180 ---> jumlah sudut pada segitiga selalu 180
60 + <BCA + 55 = 180
115 + <BCA = 180
<BCA = 180 - 115
<BCA = 65
<BCF + <BCA = 180 ---> berpelurus
<BCF + 65 = 180
<BCF = 180 - 65
<BCF = 115