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X = Sudut Segitiga Terkecil
Y = Sudut Segitiga Sedang
Z = Sudut Segitiga Terbesar
Y = 30⁰ + X
Z = 10⁰ + Y
Jumlah sudut dalam suatu segitiga = 180⁰
X + Y + Z = 180⁰
X + (30⁰ + X) + (10⁰ + Y) = 180⁰
2X + 40⁰ + Y = 180⁰
2X + Y = 140⁰
2X + (30⁰ + X) = 140⁰
3X = 110⁰
X = 110⁰/3
Y = 110⁰/3 + 30⁰ = 200⁰/3
Z = 200⁰/3 + 10⁰ = 230⁰/3