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3x - 28° +2x + 8° = 180°
5x - 20° = 180°
5x = 200°
x = 40°
< ABC = 3x - 28° = 3(40°)-28° = 120° - 28° = 92°
Maka < ABC sudut tumpul
karena berpelurus
3x - 28 + 2x + 8 = 180
5x - 20 = 180
5x = 200
x = 40
besar sudut ABC = 3x - 28 = 3.40 - 28 = 92'
maka
jenis sudut ABC adalah sudut tumpul