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n + 2n = 180°
3n = 180°
n = 60°
dicari 2n
2n = 2 . 60
= 120°
semoga membantu
besar susut tersebut = 2x
2x + x = 180 (sudut berpelurus)
3x = 180
=
x = 60
Besar sudut tersebut = 2x
Besar sudut tersebut = 2(60)
Besar sudut tersebut = 120
Jadi, besar sudut tersebut adalah 120°