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sudut 1 = 38⁰
sudut 2 = 75⁰
Jumlh sudut segitiga = 180⁰
maka :
180 = sudut 1 + sudut 2 + β
180 = 38 + 75 + β
180 = 113+β
β = 180 -113
β = 67⁰
maka,
B adalah 180 - (38+75)
= 180 - 113
= 67