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60+3x+2x= 180
60+5x=180
5x=120
x=24
sudut B= 3x=3(24)=72°
A=60°
B= 3x°
C= 2x°
jumlh sudut segitiga = 180
maka :
180 = sudut (A+B+C)
180 = 60 + 3x + 2x
180 = 60 + 5x
5x = 180-60
x = 120/5
x = 24 °
jadi besar tiap sudut :
A=60°
B= 3x° = 3 x 24 = 72°
C= 2x° = 2 x 24 = 48°