3x +60° = 120°
3x = 120°-60°
3x = 60°
x = 20°
besar kedua sudut sama (dalam berseberangan)
maka
120° = 3x + 60°
120° - 60° = 3x
60° = 3x
x = 60°/3
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3x +60° = 120°
3x = 120°-60°
3x = 60°
x = 20°
besar kedua sudut sama (dalam berseberangan)
maka
120° = 3x + 60°
120° - 60° = 3x
60° = 3x
x = 60°/3
x = 20°