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Sudut yang belum diketahui = 2/3 x 180°
= 120° b.
Jadikan jawaban tercerdas ya,...................^_^
2n + 3n = 180
5n = 180
n = 36
besar sudut = 2n
2n = 2 x 36
2n = 72
jadi besar sudut tersebut adalah 72°