Besar sudut-sudut suatu segitiga adalah 5×,(×+26)°dan(3×+19)°

5x+x+26+3x+19 = 180
9x + 45 = 180
9x = 180-45
9x = 135
x = 15
Mk
5x = 75°
x+26 = 41°
3x+19 = 64°

180 = 5x+(x+26)+(3x+19)
180=9x+45
x = 135/9
x=15°

maka
5x = 5(15) = 75°
x+26= 15+26 = 41°
3x+19=3(15)+19=64°