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= 180 - 55 - 47
= 78
sufut luar segitiga
= 180 - 78
= 102
atau menggunakan cara cepatnya
x = 55 + 47
= 102
hasil sama aja jawabn 102
180-55-47 = 78
180 - 78 = 102
jadi, sudut luar besarnya 102 derajat celcius.
semoga membantu, maaf ya klo salah..