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jika Sudut didpn garis b adlah β
Jika sudut didpn garis c adlah γ
maka
Cos α =
=
=
α = arc cos ( = 33,56°
Cos β =
=
β = arc cos () = 50,7°
utk у dgn cara yang mirip, atau tinggal mencari sisa sudut : 180 - (33,56+50,7) = sekian derajat