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Sudut ujung satu segitiga = 360⁰/n
Misalkan sudut yang lain = x, maka :
2x = 120⁰
x = 60⁰
Jumlah sudut segitiga = 180⁰
2x + 360⁰/n = 180⁰
2.60⁰ + 360⁰/n = 180⁰
120⁰ + 360⁰/n = 180⁰
360⁰/n = 180⁰ - 120⁰
360⁰/n = 60⁰
n = 360⁰/60⁰ = 6
Jadi, bangun berbentuk segi enam