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Penjelasan dengan langkah-langkah:
3x + (4x-5) + (50+2x) = 180°
9x + 45° = 180°
x = (180°-45°)/9 = 135° /9 = 15°
b. besar sudut masing-masing
3x = 3 (15°) = 45°
4x -5 = 4(15°)- 5° = 55°
50+2x = 50°+ 2(15°) = 80°
semoga membantu