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(3x+10°)+(x+15°)+(4x-5°) = 180°
3x+x+4x+10°+15°-5° = 180°
8x+20° = 180°
8x = 180°-20°
8x =160°
x = 160° : 8
x = 20°
Sudut P = 3x+10°
sudut P = 3(20°)+10°
sudut P = 70°
sudut Q = x+15°
sudut Q = 20°+15°
Sudut Q = 35°
sudut R = 4x-5°
sudut R = 4(20°)-5°
sudut R = 75°
urutan sudut sudut dari yang terpendek yaitu sudut Q, sudut P, sudut R