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9x + 5x + 4x = 180°
18x = 180°
x = 10°
Maka , cari sudut masing - masing menurut substitusi x :
9x = 9(10°) = 90°
5x = 5(10°) = 50°
4x = 4(10°) = 40°
8. Dibilang sejajar , maka :
3x - 10° = 2x + 20°
3x - 2x = 10° + 20°
x = 30°
Sudut A = 3x - 10°
= 3(30°) - 10°
= 90° - 10°
= 80°
9. Sudut B = 2x + 20°
= 2(30°) + 20°
= 60° + 20°
= 80°
== YANG 10 DAN 11 AKU COBA LAGI BNTR ==